Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb26ba626d71302…

MALICIOUS

PDF

104.7 KB Created: 2021-07-01 10:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 880d27fd229a8abd71864966f9873b06 SHA-1: 0134beadf5b91e85ff25f60178df6f5bf317bc5b SHA-256: 7fb26ba626d713025346f3aaa2a98d09655892643b717c4882343f7c34344357
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://alexhoffordphotography.com/temp/files/file/63727702927.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070454d75923---22309365296.pdf
    • https://pindimana.in/uploads/file/tugajinerolut.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d236858e271c7b5037e26449b025f238/71116066041.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090313d3e1bc---31364864014.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/473b2b644f287663b7d85639bdfc7f15/weribudikopa.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/e9d020cffaddad43f9f1dc3f028b9a5b/32173799946.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f12b4a6f86---bapuxolu.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1656af72e---repowujipokaxumusojow.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b300d493632---84070539146.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4877a076---53174387832.pdf
    • https://liantoong.com/archive/upload/files/64651765060.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/79003374969.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e68b70a5---36519426938.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e17c7f2b61---81631426677.pdf
    • http://train-in-japan.com/images/blog//file/21663646742.pdf
    • http://allasclub.com/campannas/file/galalol.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/590a883903afc76a30db0f80aa3061d9/retojilesanitom.pdf
    • https://acgroupenterprise.com/userfiles/file/wilojovoboditojamipefiwo.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3dfb4cd9---84562720698.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5eec57cd79cf04d621381df7a076e3f4/galujivelavuvipimerane.pdf
    • https://atpl.aero/ckfinder/userfiles/files/1030245125.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160925e8b28be0---doridoxuwowukire.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/58b19e44df0fcc66d0b0d2e3ea936be0/wituzisonu.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/3b21a9249694318d7d891cd8cf7fcd6d/kodugogesim.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b315070dd---45782563017.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+draw+a+reaper+leviathan
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118a2.bin
142a795bda2f93ce3c8bc70feae0c680a05c84abfea7fcf6bd878346e9fa250f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 19316 bytes
font_01_sfnt_off00014acc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACC 16792 bytes
font_02_sfnt_off000162dd.bin
885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162DD 17112 bytes
font_03_sfnt_off00017bc4.bin
27d5f2774ed4991cf941ce5817724e189e488d920297ca4e4a8cea8ed201c7af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC4 10464 bytes

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