/usr/share/kde4/services/ is in okular 4:16.08.2-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/services/libokularGenerator_comicbook.desktop
/usr/share/kde4/services/libokularGenerator_dvi.desktop
/usr/share/kde4/services/libokularGenerator_fax.desktop
/usr/share/kde4/services/libokularGenerator_fb.desktop
/usr/share/kde4/services/libokularGenerator_ghostview.desktop
/usr/share/kde4/services/libokularGenerator_kimgio.desktop
/usr/share/kde4/services/libokularGenerator_mobi.desktop
/usr/share/kde4/services/libokularGenerator_ooo.desktop
/usr/share/kde4/services/libokularGenerator_plucker.desktop
/usr/share/kde4/services/libokularGenerator_poppler.desktop
/usr/share/kde4/services/libokularGenerator_txt.desktop
/usr/share/kde4/services/libokularGenerator_xps.desktop
/usr/share/kde4/services/okularComicbook.desktop
/usr/share/kde4/services/okularDvi.desktop
/usr/share/kde4/services/okularFax.desktop
/usr/share/kde4/services/okularFb.desktop
/usr/share/kde4/services/okularGhostview.desktop
/usr/share/kde4/services/okularKimgio.desktop
/usr/share/kde4/services/okularMobi.desktop
/usr/share/kde4/services/okularOoo.desktop
/usr/share/kde4/services/okularPlucker.desktop
/usr/share/kde4/services/okularPoppler.desktop
/usr/share/kde4/services/okularTxt.desktop
/usr/share/kde4/services/okularXps.desktop
/usr/share/kde4/services/okular_part.desktop