Haloform Reaction of Furfural
Aldehydes can be oxidized by bromine under acidic conditions per the mechanism is given below.  The haloform reaction, however, occurs under basic conditions and requires a methyl ketone.  Your professor probably forgot that the haloform is for methyl ketones in basic conditions and called the reaction below a haloform even though it isn't. Given the similarity in the oxidation of the carbonyl group to a carboxylate with a halogen, (and the thousands of organic reactions to remember,) it seems like a simple easy mistake.