Olivier Giroud also struck twice as France hit six for the first time since crushing Faroe Islands in 2007.
Ribery opened the scoring from the penalty spot after seven minutes and played a part in all the goals.
Giroud doubled the lead in the 16th minute with a superb curling shot over goalkeeper Mitch Langerak and the in-form Arsenal striker added a third goal 11 minutes later following good work by Ribery and Samir Nasri.
Ribery and Nasri were also involved in the fourth goal which came courtesy of a 20-metre drive from Yohan Cabaye.
Mathieu Debuchy made it 5-0 two minutes after the break and Benzema, booed when he came on as a substitute at halftime, completed the scoring from close range in the 50th minute.
Australia, who were hammered 6-0 by 2014 World Cup hosts Brazil last month, have now conceded 19 goals in four games.
France, who are second in Group I, play their final World Cup qualifier at home to Finland on Tuesday.
(Reporting by Gregory Blachier; editing by Tony Jimenez)
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