Of course, I can use a "fake" certificate, but in this way I obtain a pdf
signed with the wrong cert.
Then I need to replace the signature and the cert with the right ones.

So we are at the heart of my problem.
How can I do this substitution?
I think there are 2 possibilities:
1-sign the pdf one time simply to obtain the certificate and then sign again
to obtain the real signed pdf.
2-sign the pdf one time simply to obtain the certificate and then replace
into the signed pdf the certificate and the signature with the right ones.

If your solution is the first one, the problem for me is that the signature
application used in my application is base on GSM network.
The signature operation consists of a phone call done by the customer and of
a pin requested to him.
Application's customers can be thousands, and each of them has to sign the
same pdf with his own certificate.
So it would be really nice if I could avoid a double signature each time a
customer has to sign this pdf.

If your solution is the second one, I have no idea about the way to do it.
In this case it would be great a sample code to drive me step by step.

Thank you for your patience 

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