Does anyone know if this withdrawal can be canceled?
There is no way to cancel pending withdrawals on freebitco.
According to
transactions history of their FUN token address, they haven't processed any withdrawals since 10 days ago.
On July 28, they processed some withdrawals, but it seems that their FUN token holding was not enough and they didn't process all pending withdrawals.
Hope they process more withdrawals soon and you receive your fund.
On page 22 of 400 you can see their previous payout time was 40 days ago, I think they're paying funtokens once per month.