I have seen this claimed, but I have never encountered it, even in historical documents. It seems to me to be a false meme.
Well, Dark = Evil is a popular western meme- villains wear black hats, sometimes even black clothing. Evil magic- Black Magic, aka "The Dark arts." Black Knight, "black rage", Black Death, Black Dog (
http://en.wikipedia.org/wiki/Black_dog_(ghost)) ...the list goes on.
In early American literature, you find references to the "dark forests" in which the feared unknown- or even known, if they were on bad terms with the local Native Americans- lurked for the unwary. And, of course, there was "deepest, darkest Africa..."
When applied to race, its not so cut & dried, though.
In the East, a light skin was often associated with aristocracy, whereas those of dark skin were
obviously field hands & laborers. IOW, it wasn't about race, it was about social status.
In the West, the guys who wrote the histories were usually the Caucasians, who, once they ventured outside of Europe and Asia, kept conquering societies that were composed of darker skinned individuals. Over time, some of them started equating the accident of their relatively advanced society with innate superiority.
Dark wasn't so much a descriptor of evil so much as a marker of inferiority.
(Nice catch on the Curse of Ham, BTW.)
But...
...what I have not seen is anyone, ever, within Western civilisation* actually saying "black skin tone indicates evil".
The Nazis missed this one, but the KKK and some other American white supremacists didn't. Most of them don't go beyond calling us inferior, but some do, with rhetoric claiming that we are so inherently flawed that any of us could commit the most heinous of crime at any time, that we are the sole source of societal ills in this country.
Those guys believe in the death penalty for minorities in the US, with them being Judge, jury and executioner- no trial necessary.
No joke- there have been so many negative depictions of albinos in American movies over the past 20 years, that there is actually an organization that protests them when they pop up.