Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6251a73e846a872…

MALICIOUS

PDF

73.1 KB Created: 2021-06-05 17:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57ccf29f75c8d5ea5f189fd38787dbb8 SHA-1: 6b74be58dbd3c3312c3d5e5953fb8d96992d5a2e SHA-256: c6251a73e846a872a02d6dc93dc4d1f179bf063bb46aca56353879c9c06d6273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=how+to+peak+and+tune+a+cobra+29+cb+radio
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c1121bdebf277961b88920ef961a24ba/95808527686.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a394343f---25627805567.pdf
    • https://alianzatours.com/imagenes/file/pinebu.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/08042d8c5d96478255d2fe11db611d99/similu.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8e088c5b0145834888ded0d57f7d50c4/tisodasusuvopesepu.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/524ce9356adf1c7b5121538e46a59e99/57256705090.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf3a7584f2---13482958111.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f5cc466ff24ddfe6f6aad8909f3a2b5/65911195771.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0aa97925e---42387843368.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503140809801764.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8b1a2a50---61137499206.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gojk9h5appquiel7e0qbb0l56i/30921781946.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d38r0a4mdfs7ghceldl5139bqk/94993733507.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/91307e179a5263643280bb06d1872241/xidegodos.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d20d64670---dejavag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e091.bin
ef6b05e2750fce76649b4b070a03e53c08113dc755ddefc273885407b47dedb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 5404 bytes
font_01_sfnt_off0000f30a.bin
ac8c3c941674a7916384ddd22965787949631f7afce39ccfb12b9df83559b8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 10684 bytes

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