They used to call that, "Painting the (ticker) Tape."Of course it can occur honestly if shares offered were pulled down too early, just before the close. Since the vast majority checking the closing price don't check a sequence of trades, it is easy to create a false impression.
But, it's trading down a few cents this morning, so no lasting effect, unless you are the guy who chased it up to U.S. $1.81 today.