Malicious PDF — malware analysis report

Static analysis result for SHA-256 132b6f9b5393b5ef…

MALICIOUS

PDF

79.4 KB Created: 2021-07-04 23:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 270fbba18254bc671fe82f60a9f6d46a SHA-1: 03201c8de312c8f3f4721f0acd6f26799f52b025 SHA-256: 132b6f9b5393b5ef586658c8a7bbc32fe25059f1e5d8558fc04e0c653a3399ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a specific ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further indicates a tracking or campaign-oriented distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=red+dog+teck
    • http://bugaboo-buffalo.eu/UserFiles/File/24358679038.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/98073112180.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42f226ca10---80697325776.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2erj2sln1op0d1ckr9rjqj0rdi/womumaxixujasobep.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d16a5ffd2---tifogom.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hgj97avesei0obt5jopgc2d811/70814028401.pdf
    • https://boyanbolyarski.com/userfiles/file/kazikarokitatogitix.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/sunuvufona.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7am1kren5abm2ls494svbv5l6s/kuxufonenefolezugelimevox.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/18d8d61c292a57eaee8f50c429e34953/13674735109.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1affd4168---lavudugoxo.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ccae3069da6b22d11627061a766919a3/bajokerumavefotimorazav.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c004fe91340---kezaze.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/70bf36bef763ead8b88cad7da265206b/zagumuzovekaxil.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2e88deba7c03e3643fb4e35ebe3ce68c/37649413498.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/53122569fb70daabe56644ce0c5c590d/dolodonamipozodexat.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/86569815884.pdf
    • https://daismene.it/file/patesebizuziluvipovakekex.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc977ddeb---bejasefi.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/94073a0d66a85be38064a894e1f6c08b/rewemu.pdf
    • http://modero.vn/upload/files/zusemosuw.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/14058332119.pdf
    • http://studiodrago.eu/userfiles/files/68336744022.pdf
    • 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_off0000d5cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16792 bytes
font_01_sfnt_off0000ede1.bin
b36d2cc0dedae8d0d0f9baa35d7957bdd841d0ad7cc5673c8e69ff0bfd4b0855
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 17184 bytes
font_02_sfnt_off00011ac5.bin
67a8a55327dc311604556724f8e9d49a57aeaf0da516ab28499ea5bb25e0a174
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 10012 bytes