I don't have access to the physical book, but from what I can find on d20pfsrd and archivesofnethys, it looks like just the generic. A small phantom doesn't seem to gain any base stat adjustments the way a small eidolon gets +2dex, -4str, -2con.
Agreed. I cannot find any indication of changes to the ability score of a small phantom (other than the generic +1 attack/AC, +4 Stealth, -1 damage die size, etc.).