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This object contains the information needed to validate the signature and has inside, among other fields, the offsets of the bytes used to compute the hash of the signature.
The hack here is to add content to an already signed PDF but to either remove this range or change it to an invalid value. The result is a PDF that has a valid signature inside but an invalid signature object.
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The validation logic in some of the tested software defaults to displaying that the signature is valid and drops any warnings about not being able to calculate the hash of the signature.
By taking a signed PDF and adding unsigned content, the reader software should notice that the added part is not signed and present a warning.
But it is possible to add content in a way that is not compliant to the PDF specification and make the reader not notice that there was content added in the first place when it comes to signature checking and still render the content on-screen. Instead of invalidating the byte range offset as in the USF attack, the attacker manipulates a signed PDF file byte ranges field in a way that he can insert content between the signature and the end of file.
It appears that every reader is affected and that no help is coming for older systems. Used with permission from Article Aggregator.
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File File history File usage No higher resolution available. Summary [ edit ] This image was created by Dagmar D'Surreal, in or thereabouts.
Licensing [ edit ] This work is licensed under the Creative Commons Attribution 3. Other Instructions.As platform support for teaming and reporting is more widely adopted, look for teams of hackers to grow their skills through mentorship and collaboration.
Whitehat hackers are recognizing this and responding by teaming up to get more eyes and creativity on difficult targets. The result is a PDF that has a valid signature inside but an invalid signature object. This is what current bad actors are doing.
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