Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8f73e6f176eecb…

MALICIOUS

PDF

76.5 KB Created: 2021-07-23 22:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10c01dc5c12d5e6119555c8e067c42d8 SHA-1: 348e4e7fd514560dc3cd417c6404e3706fd78f74 SHA-256: 2a8f73e6f176eecb9ce3589a502437cf172d021fd9c91d4fb919f56ee06f10cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised websites and potentially malicious PDF files. The presence of numerous links to external sites, many hosted on compromised CMS platforms, indicates an attempt to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sntaviator.ru/ckfinder/userfiles/files/19230146194.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb8d035d3---32415608628.pdf
    • http://bulk-supplies.com/userfiles/file/57991521722.pdf
    • https://ancoraeducacion.com/images/2563937094.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfc30d760---72979008650.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7927797a33---vikobaxuzukejad.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c837419ed634cfab2bf45eeaa2abf709/61502912755.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160889f61339ee---30210393734.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607959e49e32e---rabavatedis.pdf
    • http://hesexpo.com/img/editor/image/file/buvitobimed.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/19ljd8737r7dhj50m1sd0j0s44/22967217157.pdf
    • https://diarch.in/WYSIWYGImage/file/57591085821.pdf
    • https://uclerbaklava.com/resources/file/52363897913.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/157c2afaee987b82a326eb1cc5f96060/duluv.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/30ab2fd63a8f805693340fd874b15032/gofatigezutiw.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa2e816e0---dujoremaret.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/18169657828.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba414dfafd---kilit.pdf
    • http://leaguengn.com/userfiles/file///23529670010.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/le18pul42t1m5bv2od4qv69khp/kerazepebawawepudovazokij.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b075c39f8c4---woxomolopibexinomam.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160846893ced19---bokexudojaxulajifas.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4nnm2q80m97ko5sa12489godq6/webonaser.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/eff392c4205a5e784e726450e6f2f0ee/mefujajirogogejur.pdf
    • http://shreejians.com/userfiles/file/26253079683.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=guided+reading+and+review+workbook+economics+answer+key
    • 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_off0000c7bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 16792 bytes
font_01_sfnt_off0000dfd2.bin
949228f9d9fa22058aed93e3939fb91591799903477ef8344dc055eaa0ef2687
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 11208 bytes
font_02_sfnt_off0000f9e6.bin
c38c6db711c447d41c4eeb2c64a16da2d3ccc24f14a2e393a06b20974a9345cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 15908 bytes