The following link gives an error instead of a thumbnail:
https://upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Етнографічний_збірник_Т.28.pdf/page1-7625px-Етнографічний_збірник_Т.28.pdf.jpg
The error message is:
Error creating thumbnail: /bin/bash: line 1: 6515 Done 'gs' -sDEVICE=jpeg -sOutputFile=- -dFirstPage=1 -dLastPage=1 -r150 -dBATCH -dNOPAUSE -q '/tmp/localcopy_e0efc8af0d37-1.pdf'
6516 Killed | 'convert' -depth 8 -resize 7625 - '/tmp/transform_6808bfed72ec-1.jpg'
Version: unspecified
Severity: normal