Ferdinand has been absent with injury for much of this season and said: "These are the games you want to play in, the things you love and enjoy."
It was Ferdinand's foul on Adam which led to the free-kick, with opposite camps feeling either that the Scot made the most of minimal contact or that Ferdinand was fortunate to escape a second yellow card.
"There was the slightest contact, but I don't think it was enough to make a fella of 12 or 13 stone fall on the floor," Ferdinand said.
He praised the character of his side, though, adding: "They created a couple of chances towards end but for most of the second half I thought we controlled it and played good football. In the final third, if we'd made those good decisions, we could have had opportunities."
"We showed the resilience you need to come places like this and get a point."