Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c864a8b3531614…

MALICIOUS

PDF

95.0 KB Created: 2021-08-07 05:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d974148b94e112bf0164b590e5e158f6 SHA-1: 08a28209beafd6f727d9235b1dc1c8d44ba3267d SHA-256: c5c864a8b35316140219397dca04be8d7be132cf08f0b889394d881b04d11256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious sites. The document body is unreadable, but the heuristics indicate a link farm hosted on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://daxitrip.com/basefile/daxitripcom/files/kufodalokerufotorijumela.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7eb948105d2117df1803e6268e526588/86964408442.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/euvo08s4q1qcd92rehf5840pgl/webujabujuxuxolux.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160917c2d0bfe2---77517990923.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160775d38cf28c---mebimufuwe.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/mirebedaserefi.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/99286150083.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/961e66cdce60d720e3f59f79d2268af5/5526049532.pdf
    • http://datavincity.com/uploads/ckfinder/files/810745274.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/q800lub3g78n187rpa8ll38a58/53895420287.pdf
    • http://scheidenschiedam.nl/uploads//file/64132266586.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/pegativuwawukigur.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609671e7d9e18---sarudasekozolumigita.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fb3cd2b61---92084803573.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/80600525250.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3e5e25f5a---rajidetefo.pdf
    • http://www.zywawiara.pl/pliki/48819068795.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2dff0b22d16a661d33ab01013e09b65c/kibaxigilekapowujoju.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/34452947848.pdf
    • http://vin-baietii.ro/ckfinder/userfiles/files/57866055355.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96251630577.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/49db65ce34ba642a2631e9f76fd503e4/novofijevuvez.pdf
    • http://pi-consulting.ch/download/pevuguponozilogifi.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160946b546cfbf---92430760573.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ejemplos+de+enlaces+covalentes+con+estructura+de+lewis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ee.bin
9929826bb0f9d0cfbef366aabb03f84bf5c876aefeeb91a67fb2bff84f0c4c8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 11040 bytes
font_01_sfnt_off0001209d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 16792 bytes
font_02_sfnt_off000138af.bin
b9ba19bee167b40c4836631a688ba577253d5c956dec19e1c30a7215f95eaf6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 19420 bytes