\documentclass{article}
\usepackage{lipsum}
\usepackage{bidi-atbegshi}
\usepackage{bidi}
\setbox0\hbox{\Huge\textbf{Upper Left}}
\setbox1\hbox{\Huge\textbf{Upper Right}}
\setbox2\hbox{\Huge\textbf{Lower Left}}
\setbox3\hbox{\Huge\textbf{Lower Right}}
\AtBeginShipout{%
\AtBeginShipoutUpperLeftForeground{%
\put(0,-\ht0){\usebox0}
}
\AtBeginShipoutUpperRightForeground{%
\put(-\wd1,-\ht1){\usebox1}
}
\AtBeginShipoutLowerLeftForeground{%
\put(0,\dp2){\usebox2}
}
\AtBeginShipoutLowerRightForeground{%
\put(-\wd3,\dp3){\usebox3}
}
}
\begin{document}
\lipsum
\end{document}