Hi, I'm Sudipto. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP
It seems from your description that, the waste ink absorber is overflowing or the black cartridge has a leakage. That is why you see the black ink on the jammed paper. Please follow the steps from the link below to clean the feed rollers and let me know, if you are able to complete the job or not?
OK, no problem. You can check the link below, where you will find all the ways to clear jammed paper. Please let me know, if this help or not?