Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cf2b19a7322652…

MALICIOUS

PDF

96.0 KB Created: 2021-07-03 12:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c7104dc1855bcae2a82d62cec7853bf SHA-1: 4d9591cf1d41d6e860735ca77ab24461e3360b2a SHA-256: 51cf2b19a7322652d9a042e77d5e264e5c79073ca5495c43fd0498fb161bb6bb
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised or disposable hosting domains, likely to download a secondary payload. The presence of invoice and download button lures further supports a phishing or scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mebelihome.ru/upload_picture/juguwewegotone.pdf
    • https://cuisinescartier.ca/upload/editor/file/38061373461.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4a94419866806d34609d58ef74f719fb/jifezavomilivolonumapoxop.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086806e14ff3---85138203306.pdf
    • http://nissanotogovap.com/uploads/images/files/miranuxavilukuju.pdf
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/natiwefofojo.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ac0deb2f3d9cc792ac956fffdccfefe/83456498489.pdf
    • http://kulturazebrak.cz/userfiles/37129043718.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43637a01cb---21671085731.pdf
    • http://gioiacompany.net/images/upload/file/55815536523.pdf
    • http://abpaluso.com/upload/file/71581118371.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a93b5ec3136---98157219751.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93785d4c3---1439871874.pdf
    • http://clingac.es/d/files/jatuv.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1bee5a658---3713450335.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/a26lfiqpmim167r27en57a40vv/pozazozejelebadoduzenefa.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608097be00c54---butedizuduvap.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a88fe86d954---74352781069.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/780a22d1b91de8d0898245c7fe320599/207225321.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/a3c8af264d896a2064ab2dd345d6a5c7/rajozonipeporalanen.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882c81099a---33715836224.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9ac932461b74b31333d87c52ac254a8a/14314049095.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cc122ba77cd3e948310d3b6ac6c971ef/48227129746.pdf
    • http://digitalpolicycouncil.com/imagenes/file/vodidizuxaxotebapo.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ebe3oplsbtljm9qegilh7ftcl2/towetaratakalijiz.pdf
    • http://alnadaoil.com/userfiles/file/31103390955.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=life+is+beautiful+questions+and+answers
    • 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_off0000fa64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 16792 bytes
font_01_sfnt_off0001127b.bin
82cd11f9f8048595ddf32a3d0cc06d51d5ec1357e762ff4926fffed4caf18f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 10776 bytes
font_02_sfnt_off00012b41.bin
49af513be5584b63ffb3764bee6623887ad08f97da0f4f962e57d3c96009cc3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 16368 bytes
font_03_sfnt_off00014189.bin
c01d006f9ff4be4502ef657c51fe9f03a4d8de5b633f8252368886ff2c2e0656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14189 17928 bytes

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