Is he young? Most young ferrets tend to do that. They usually stop when they are older.
As for now. I have heard success with this spray called bitter apple. You can find it at Petco I believe. It is also used to help teach ferrets not to bite. Spray some on his cage bars and he should stop. A few like the taste though.
Just remember not to take him out when he does that. As it will teach him that his bad behavior gets him what he wants (your attention).
I have only had this problem with a few of my ferrets. As I tend to go more for the elderly ones.
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1 Rat: (Ace)
1 RC Hamster: (Hannibal)
3 Cats: (Tao, Drew, Jak-ke)
2 Ferrets: (Fisher, Georgie)
1 Betta: (Maxwell) + (5 Platies and 1 Molly)
Rest in peace all my little Mice: Tempo, Aaron, Tatiana, Pei, Shi, Orange, Spotty, Lee Hyun, Key, Calvin, Chun, Jiro, Hero...
And my past Dookers: Lulu (my heart), Frodo (my old man), MoneyPennies (the first one), ect...
Aswell as all my lost Cats (my beloved Haru, ect..) and Bettas (Stahl the creepy one, ect..)