diff --git a/test/pdfs/issue818.pdf.link b/test/pdfs/issue818.pdf.link
index c7ed0236..87a456b0 100644
--- a/test/pdfs/issue818.pdf.link
+++ b/test/pdfs/issue818.pdf.link
@@ -1 +1 @@
-http://www.effi.org/system/files?file=effi-siv-251110.pdf
+https://web.archive.org/web/20150926032048/https://effi.org/system/files?file=effi-siv-251110.pdf
diff --git a/test/pdfs/issue919.pdf.link b/test/pdfs/issue919.pdf.link
index 68300113..0df4f371 100644
--- a/test/pdfs/issue919.pdf.link
+++ b/test/pdfs/issue919.pdf.link
@@ -1 +1 @@
-http://agb.traviangames.com/Travian_AR_Terms.pdf
+https://web.archive.org/web/20111027045653/http://agb.traviangames.com/Travian_AR_Terms.pdf
diff --git a/test/pdfs/jai.pdf.link b/test/pdfs/jai.pdf.link
index 54e17dfc..d08d075b 100644
--- a/test/pdfs/jai.pdf.link
+++ b/test/pdfs/jai.pdf.link
@@ -1 +1 @@
-http://download.oracle.com/docs/cd/E19957-01/806-5413-10/806-5413-10.pdf
+https://web.archive.org/web/20160115202027/http://docs.oracle.com/cd/E19957-01/806-5413-10/806-5413-10.pdf
diff --git a/test/pdfs/liveprogramming.pdf.link b/test/pdfs/liveprogramming.pdf.link
index 390da08e..c6123782 100644
--- a/test/pdfs/liveprogramming.pdf.link
+++ b/test/pdfs/liveprogramming.pdf.link
@@ -1 +1 @@
-http://blog.lassus.se/files/liveprogramming.pdf
+https://web.archive.org/web/20120730111852/http://blog.lassus.se/files/liveprogramming.pdf
diff --git a/test/pdfs/mao.pdf.link b/test/pdfs/mao.pdf.link
index a972707b..c32c7dcb 100644
--- a/test/pdfs/mao.pdf.link
+++ b/test/pdfs/mao.pdf.link
@@ -1 +1 @@
-http://www1.ihns.ac.cn/readers/mao.pdf
+https://web.archive.org/web/20140501023554/http://www1.ihns.ac.cn/readers/mao.pdf