"I was terrified," Wolf told the "Today" show last month.
"I started screaming, bawling my eyes out. I was on the phone with my mom, and I felt helpless because I wasn't sure what to do."
Wolf and her mother went to the FBI in March.
Agents raided Abraham's home in June and discovered hacking software, as well as explicit images and videos of some of the victims.
In another case, the federal complaint said a 17-year-old girl from Ireland gave in and agreed to strip for the Abrahams via video chat.
She allegedly told Abrahams, "Please remember I'm only 17. Have a heart."
Abrahams replied, "I'll tell you this right now! I do NOT have a heart! However I do stick to my deals! Also age doesn't mean a thing to me!"
Abrahams faces up to two years in prison.
His family said he suffers from mental illness.
“The family wants to apologize for the consequences of his behavior to the families that were affected,” his lawyer, Alan Eisner, told reporters after the bust.