diff --git a/test/pdfs/issue1466.pdf.link b/test/pdfs/issue1466.pdf.link
index 22ebf7e2f..95fb4364c 100644
--- a/test/pdfs/issue1466.pdf.link
+++ b/test/pdfs/issue1466.pdf.link
@@ -1 +1 @@
-http://web.missouri.edu/~fanxud/publications/On%20the%20performance%20quantification%20of%20resonant%20refractive%20index%20sensors.pdf
+http://web.archive.org/web/20140716112648/http://web.missouri.edu/~fanxud/publications/On%20the%20performance%20quantification%20of%20resonant%20refractive%20index%20sensors.pdf
diff --git a/test/pdfs/issue1629.pdf.link b/test/pdfs/issue1629.pdf.link
index 1d18104b5..7c06850a4 100644
--- a/test/pdfs/issue1629.pdf.link
+++ b/test/pdfs/issue1629.pdf.link
@@ -1 +1 @@
-http://is.muni.cz/www/20544/noty/sbm/Taize/Adoramus_te_Christe.pdf
+http://web.archive.org/web/20160115122540/http://is.muni.cz/www/20544/noty/sbm/Taize/Adoramus_te_Christe.pdf
diff --git a/test/pdfs/issue1658.pdf.link b/test/pdfs/issue1658.pdf.link
index f77372073..09763229e 100644
--- a/test/pdfs/issue1658.pdf.link
+++ b/test/pdfs/issue1658.pdf.link
@@ -1 +1 @@
-https://www.ads.tuwien.ac.at/teaching/archiv/praktika/CherkasskyGoldberg-1995-MaxFlow.pdf
\ No newline at end of file
+http://web.archive.org/web/20060926175052/http://www.ads.tuwien.ac.at/teaching/archiv/praktika/CherkasskyGoldberg-1995-MaxFlow.pdf
diff --git a/test/pdfs/issue1685.pdf.link b/test/pdfs/issue1685.pdf.link
index bf6b86240..2c11df9c1 100644
--- a/test/pdfs/issue1685.pdf.link
+++ b/test/pdfs/issue1685.pdf.link
@@ -1 +1 @@
-http://www.agapec.com.br/manual/manual_2007.pdf
+http://web.archive.org/web/20120617064647/http://www.agapec.com.br/manual/manual_2007.pdf
diff --git a/test/pdfs/issue1687.pdf.link b/test/pdfs/issue1687.pdf.link
index 83a73947a..7e34709a4 100644
--- a/test/pdfs/issue1687.pdf.link
+++ b/test/pdfs/issue1687.pdf.link
@@ -1 +1 @@
-http://www.karynellis.com/charts/bird/KarynEllisChordChart-BIRD.pdf
+http://web.archive.org/web/20160115122848/http://www.karynellis.com/charts/bird/KarynEllisChordChart-BIRD.pdf