diff --git a/test/pdfs/issue3384.pdf.link b/test/pdfs/issue3384.pdf.link
index d3a4d3707..eaa1eb8d9 100644
--- a/test/pdfs/issue3384.pdf.link
+++ b/test/pdfs/issue3384.pdf.link
@@ -1 +1 @@
-http://mirror.math.ku.edu/tex-archive/macros/latex/contrib/overpic/opic-abs.pdf
+https://web.archive.org/web/20150108202806/http://mirror.math.ku.edu/tex-archive/macros/latex/contrib/overpic/opic-abs.pdf
diff --git a/test/pdfs/issue3848.pdf.link b/test/pdfs/issue3848.pdf.link
index a56b2418b..bfeb13b1f 100644
--- a/test/pdfs/issue3848.pdf.link
+++ b/test/pdfs/issue3848.pdf.link
@@ -1,2 +1 @@
-http://www.unicode.org/L2/L2006/06334-reph-telugu-gurmukhi.pdf
-
+https://web.archive.org/web/20150905185708/http://www.unicode.org/L2/L2006/06334-reph-telugu-gurmukhi.pdf
diff --git a/test/pdfs/issue3903.pdf.link b/test/pdfs/issue3903.pdf.link
index 236f4e21d..44a36dfc8 100644
--- a/test/pdfs/issue3903.pdf.link
+++ b/test/pdfs/issue3903.pdf.link
@@ -1 +1 @@
-http://www.reloadbench.com/pdf/files/1%20Inch%20Diamonds.pdf
+https://web.archive.org/web/20070415170520/http://www.reloadbench.com/pdf/files/1%20Inch%20Diamonds.pdf
diff --git a/test/pdfs/issue3925.pdf.link b/test/pdfs/issue3925.pdf.link
index 836e0939a..aeff41555 100644
--- a/test/pdfs/issue3925.pdf.link
+++ b/test/pdfs/issue3925.pdf.link
@@ -1 +1 @@
-http://patentimages.storage.googleapis.com/pdfs/US4441207.pdf
+https://web.archive.org/web/20160115203612/http://patentimages.storage.googleapis.com/pdfs/US4441207.pdf
diff --git a/test/pdfs/issue5592.pdf.link b/test/pdfs/issue5592.pdf.link
index 19ffbb41f..e6d1380ab 100644
--- a/test/pdfs/issue5592.pdf.link
+++ b/test/pdfs/issue5592.pdf.link
@@ -1 +1 @@
-http://www.pdf-archive.com/2014/12/29/4111112/4111112.pdf
+https://web.archive.org/web/20160115203228/http://www.pdf-archive.com/2014/12/29/4111112/4111112.pdf