What is the ruling on purchasing online using a Visa card number that does not belong to the the questioner, nor does he know its owner, and he obtained it from a program on the internet?

Repentance and seeking forgiveness for theft are obligatory, and one must not return to it. What was taken of ill-gotten wealth must be returned to its owners if possible. Otherwise, it must be disposed of by spending it on charitable causes. If its owner is found later, it must be returned to him.