diff --git a/test/pdfs/issue2829.pdf.link b/test/pdfs/issue2829.pdf.link
index 3f8327707..1d2eeb034 100644
--- a/test/pdfs/issue2829.pdf.link
+++ b/test/pdfs/issue2829.pdf.link
@@ -1 +1 @@
-http://www.ym.edu.tw/bcial/property/IP/laws/iplaws01.pdf
+http://web.archive.org/web/20150211163733/http://www.ym.edu.tw/bcial/property/IP/laws/iplaws01.pdf
diff --git a/test/pdfs/issue2853.pdf.link b/test/pdfs/issue2853.pdf.link
index 36db6694d..d15e764bf 100644
--- a/test/pdfs/issue2853.pdf.link
+++ b/test/pdfs/issue2853.pdf.link
@@ -1 +1 @@
-http://www.celgene.de/Patienten/Newsletter-Epigenetik-201301.pdf
+http://web.archive.org/web/20130818210913/http://www.celgene.de/Patienten/Newsletter-Epigenetik-201301.pdf
diff --git a/test/pdfs/issue2881.pdf.link b/test/pdfs/issue2881.pdf.link
index 16e8e607d..084b93880 100644
--- a/test/pdfs/issue2881.pdf.link
+++ b/test/pdfs/issue2881.pdf.link
@@ -1 +1 @@
-http://www.heartfoundation.org.au/SiteCollectionDocuments/Hypertension-guidelines-ambulartory-blood-pressure-monitoring-Position-statement.pdf
+http://web.archive.org/web/20150226062525/http://www.heartfoundation.org.au/SiteCollectionDocuments/Hypertension-guidelines-ambulartory-blood-pressure-monitoring-Position-statement.pdf
diff --git a/test/pdfs/issue3062.pdf.link b/test/pdfs/issue3062.pdf.link
index 499aa7bd1..97aaf95e1 100644
--- a/test/pdfs/issue3062.pdf.link
+++ b/test/pdfs/issue3062.pdf.link
@@ -1 +1 @@
-http://www3.weforum.org/docs/TTCR/2013/TTCR_DataTables12_2013.pdf
+http://web.archive.org/web/20140925153420/http://www3.weforum.org/docs/TTCR/2013/TTCR_DataTables12_2013.pdf
diff --git a/test/pdfs/issue3999.pdf.link b/test/pdfs/issue3999.pdf.link
index 502f16e42..a293ecea9 100644
--- a/test/pdfs/issue3999.pdf.link
+++ b/test/pdfs/issue3999.pdf.link
@@ -1 +1 @@
-http://www.nber.org/papers/w4332.pdf
+http://web.archive.org/web/20151016185606/http://www.nber.org/papers/w4332.pdf