/usr/lib/x86_64-linux-gnu/qt5/qml/QMenuModel/qmldir is in qmenumodel-qml 0.2.9+16.04.20160329-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | module QMenuModel
plugin qmenumodel-qml
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