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Shares in the confectioner had risen by more than six points to 768.00 just after 10:00 GMT, as the press speculated about the possibility of a new offer.
Kraft made an attempt to acquire Cadbury earlier this year, but had its 745p a share proposal rejected.
Under Takeover Panel rules, it has until 17:00 GMT today to table another offer, or it will have to wait six months before it can try again.
The Press Association reported that Cadbury is thought to be unwilling to enter takeover discussions unless Kraft proposes a deal worth around 850p a share.
However, the Sunday Telegraph said that due to the lack of competition for the UK-based firm, Kraft will probably not improve its original offer significantly.
