/usr/lib/libGraphicsMagickWand.so is in libgraphicsmagick1-dev 1.3.30+hg15796-1~deb9u2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libGraphicsMagickWand-Q16.so.2.9.0
/usr/lib/libGraphicsMagickWand-Q16.so.2.9.0