/usr/share/ is in okular-extra-backends 4:16.08.2-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/applications/
/usr/share/applications/kde4/
/usr/share/applications/kde4/okularApplication_chm.desktop
/usr/share/applications/kde4/okularApplication_djvu.desktop
/usr/share/applications/kde4/okularApplication_epub.desktop
/usr/share/applications/kde4/okularApplication_tiff.desktop
/usr/share/doc/
/usr/share/doc/okular-extra-backends/
/usr/share/doc/okular-extra-backends/changelog.Debian.gz
/usr/share/doc/okular-extra-backends/copyright
/usr/share/kde4/
/usr/share/kde4/services/
/usr/share/kde4/services/libokularGenerator_chmlib.desktop
/usr/share/kde4/services/libokularGenerator_djvu.desktop
/usr/share/kde4/services/libokularGenerator_epub.desktop
/usr/share/kde4/services/libokularGenerator_tiff.desktop
/usr/share/kde4/services/msits.protocol
/usr/share/kde4/services/okularChm.desktop
/usr/share/kde4/services/okularDjvu.desktop
/usr/share/kde4/services/okularEPub.desktop
/usr/share/kde4/services/okularTiff.desktop
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/okular-extra-backends