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There are several reason for urinating out of the box and the first thing you want to do is rule out any medical problems especially if this is a sudden behavior.
Some of the most common medical causes are
* Urinary tract infection, crystals in the urine or other urinary problems.
It is not uncommon to see them urinate on soft or cool surfaces when there is any type of pain during urination. They often see the litter box as the cause of the pain so they will seek other areas.Cystitis is also a common problem in cats. This is inflammation of the bladder not caused by infection.In a male cat urinary tract infections and crystals in the urine can result in complications such as a blocked urethra resulting in them unable to urinate. This can be a life threatening situation and while I in no way think this is the problem no infection and crystals can lead to this so must be ruled out.Click here for more information Here is more
* Kidney Disease.
The leading cause of death in cats is kidney disease. Normally this problem is not diagnosed until the later stages of this disease. When one kidney begins to fail the other kidney over compensates and we may not see changes in the blood work until 75% of kidney function is lost. When this is the problem you may see weight loss, increased drinking and urination, vomiting, loss of appetite constipation and lack of grooming with a dull hair coat. This can also cause hind end weaknessHere is a great video that covers this condition extensively
With this we will normally see excessive drinking, urinating, increased appetite and weight loss. Left untreated this can cause nerve damage in the hind legs.
While I would not expect to see problems with the kidneys or diabetes in such a young cat especially with no other signs , however it is worth mentioning
You need to clean any areas outside the box where there has been urine If the urine soaked through to the mattress then cleaning with an enzyme based clearer is needed to completely remove any traces of smell or he may continue to use this spot.
Natures Miracle and urine off seem to work the best on cat urine,
Here is a link to these productshttp://www.naturemakesitwork.com/home/index.phphttp://urineoff.com/
I would start with a trip to the vet to have a urinalysis done. Only after a medical problem is ruled out can we look at this has behavioral. If all medical causes are ruled out then please let me know by coming back to this thread and we can go over some things for behavioral problems.All follow up is free of charge
I hope this helps, please reply back if you have additional questions