Malicious PDF — malware analysis report

Static analysis result for SHA-256 f492e1772017a055…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 00:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa6343401086486900c771ca3b8337c6 SHA-1: d227f7b1aef05f699037d85f6efab7eb31fa78a8 SHA-256: f492e1772017a0551483b85f9e974a05c9d8da5764dfe6cf85f59c10800b65af
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate this PDF is malicious, specifically a phishing trojan. Heuristics reveal it functions as a link farm, directing users to multiple external websites, many hosted on compromised CMS platforms or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dichvumayphoto.vn/webroot/img/files/mepunumuxarunibaxuxekor.pdf In PDF document text
    • http://travellerisland.com/files/darugukobip.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/6nrq29dhivsaoot3n1i35d7vjv/28611162381.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/botigi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bmvhhhqea6vg9aj9l933pjoq11/laledasamarowegewedaxi.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1d4662d1053b3f61d2dd89b5c2c6e015/37562860006.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd00fb113a4---31883055572.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf65c5336---98399788601.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/sutaselezakexobekifije.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/26572674240.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108021906184263.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/64450679554.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c3c09c742bdc7ebb49357d05d46bf2bc/40380101194.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/futoneba.pdfIn PDF document text
    • http://centrons.com/uploaded/file/162810143460cbb9685f6e6.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/90822485480.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083804bb8485---balevuniv.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ac302d1c0---90394894855.pdfIn PDF document text
    • http://alcantara.cz/data/file/buzumidagux.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3a2beaeb65745bbe96668d96c325b3ef/nagidatemamusiwowo.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/29476570687.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec50b0138---vutarumotizik.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/renobas.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/363f1f7aff31908456384dc1480ea8d6/31725631722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=recetas+comida+criolla+peruana+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10928 bytes
SHA-256: 7bc82138452a5d5f9f81e6d073a44ab93cf9dc1a9b74ad3f64acddd774a46624
font_02_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 19360 bytes
SHA-256: 9c548a6ef7efb79c0bb8433616875c456faddc80d051fadb39fc5f9730b7d156

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