Resize multiple PDF pages from A4 to A3.

[pascal079]

Hello,

 I am French and am posting this with the help of a translator. I use GIMP 3.2 on Linux Mint. 

I have a multi-page PDF in A4 landscape format, and I would like to resize all the pages to A3, also in landscape format. 

Is this possible, and if so, how? 

Thanks.