Definitely an infection / contamination going on there - probably not mold per se, though.
Generally the alcohol in beer will prevent mold from growing, but if your yeast didn't kick off, there might be a chance. Did you have good krausen in there? Good activity from airlock (not that it's always an indicator - or more specifically lack of activity doesn't mean nothing's going on)
what is your sanitiation like? Have you brewed any sours in that fermenter?
Finally, have you tasted it? You may get lucky and have something good, but it's likely a dumper. Also dump the fermenter. It's awful hard getting those bugs out of there.