I tried to look at any possible 3rd party sites that may have used UK2 to charge my card, but I could not find any. Also, since the security code was wrong, I think this was a straight up fraudulent charge.

UK 2looks like a known company, but somehow it's being used to test out credit card #s. I'm now going to have to get a new credit card and go through the hassle of changing #s due to this scam.