Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd8cb2bce0c0ae9…

MALICIOUS

PDF

128.4 KB Created: 2021-07-06 21:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 810ad2b93077b1967e221e66768e6a16 SHA-1: 31e982f9595eff50550fbc0ea65c6e3dd498f9c6 SHA-256: 6fd8cb2bce0c0ae93c28b2e396cdd5b1b339d83f426cd187a7e1b3bcfa4890b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69d942636---jizimelajelivebilefivan.pdf
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/lidorokajusiluwegegi.pdf
    • http://auksozvynas.lt/userfiles/file/40100443265.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b355170667901089bfd33f983632ad61/vinuvaluke.pdf
    • http://dges.in/userfiles/file/57092136058.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/479bf0c6124390bc5ad20c348f61cff4/vetevosetireter.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c6c1945f---kozujazedi.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24041f5ae---53671262263.pdf
    • http://planbmedia.hufiles/98429207626.pdf
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/34440685947.pdf
    • https://sasalidayanisma.org/uploads/file/zesened.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/982b510b6af610c227c5c875879ceceb/66536182613.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/ca4c2902c431d28ce5827a6188f47184/zawofugefunutibope.pdf
    • https://hse.tw/upload/file/fejevizumalegekog.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5bd162f23---77460414832.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6d821937a7ba0cee4ecc777e9df86d57/86051865009.pdf
    • http://dogninja.com/userfiles/files/11734182943.pdf
    • https://amatnieks.lv/pictures/image/fezotanefo.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/vofisegifepo.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607af63222e70---xafuzubojokovifafu.pdf
    • http://cuatro-pr.org/sites/default/files/file/69316722809.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1915406e8bd05d4ca9219356db339040/guzigez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=indian+legal+system+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_off000197f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x197F5 16792 bytes
font_01_sfnt_off0001b00c.bin
c0895fc0f844d97e14960af18c9b51644685dc5cd01a09a6619dd9b45120b435
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B00C 10688 bytes
font_02_sfnt_off0001c849.bin
dc70a2891848c8a68eb949957b525c556c94c1b9a3ddafcb438db271537e0a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C849 17032 bytes