This file is indexed.

/usr/share/kde4/config/wallpaper.knsrc is in kde-workspace-data 4:4.11.8-0ubuntu6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[KNewStuff3]
ProvidersUrl=http://download.kde.org/ocs/providers.xml
Categories=Kubuntu Wallpaper,KDE Wallpaper 800x600,KDE Wallpaper 1024x768,KDE Wallpaper 1280x1024,KDE Wallpaper 1440x900,KDE Wallpaper 1600x1200,KDE Wallpaper 1680x1050,KDE Wallpaper 1920x1200,KDE Wallpaper 2560x1600,KDE Wallpaper (other),KDE Wallpaper (SVG)
StandardResource=wallpaper
Uncompress=archive