This is probably going to be hard to split these in a way that is fair and doesn't lead to one stat being too good/bad. Still, here's a start:
Str: Trip attacks, bull rushes, grapples, entanglement.
Dex: Damage spells with a save for half, traps, avoiding stuff (Web), possibly balancing (like Grease, unless skills handle that). Possibly a feat to apply to trips and entanglement in lieu of Str.
Con: Poisons, disease, corruption, anything that physically hits you that you don't dodge.
Int: Illusions. This one is a hard one, and you could argue straight-faced that any Int-based thing could be covered by Wis. This will be a hard one to balance against the others. One route might be to make a robust skill system and to tie bonus skills to Int.
Wis: Possibly things based on perception (see, it can steal illusions from Int). Things based on mentally toughing stuff out. Still, Cha makes good sense for a lot of these...
Cha: Charms, compulsions, fear.