/usr/share/icons/veromix-plasmoid.png is in plasma-widget-veromix 0.13.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/icons/../kde4/apps/plasma/plasmoids/veromix-plasmoid/contents/icons/veromix-plasmoid-128.png