Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8e8bc372f14eed…

MALICIOUS

PDF

70.8 KB Created: 2021-09-08 04:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84dec8a6eef6bb85844fc518c204c55c SHA-1: 0c55e07db632b103faa8dc20b85f01717f5e0153 SHA-256: 3e8e8bc372f14eedfc33813b48e0fee0c0bd012dba92c60eaff88d48fc5cda23
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87fa01ed0a---8551403358.pdf
    • https://cvsc.co/userfiles/file/nufubodito.pdf
    • http://banquat.com/userfiles/files/18418572471.pdf
    • https://electroagro.es/pub/files/3134772459.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6703982715a97acd59a244fb6e37d327/17685558688.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e002c0864a5b77cde7bd2fa9a472dba5/bogif.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/42591367110.pdf
    • http://bassbasement.org/userfiles/file/28807060109.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1945bb888f90cd1778425ffe8493ad19/56191833029.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6c33153f---21947048156.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/fevewoworejosesagojefu.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/v17a61flsellh49k2j3gvubvaa/jekulepukazowun.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0ac39c42c4821470ee0ed29e0511ad2a/84307364795.pdf
    • http://saptpadi.com/files/file/69280054388.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/sexiralebixegilo.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897955d85cc---75193212440.pdf
    • http://zahradysnapady.cz/soubory/files/jazetusuvapozapukubarexe.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/waliv.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa10a985f2---35126252398.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecafe39492---toneles.pdf
    • https://gloriamus.org/Uploads/userfiles/files/62610693671.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=combine+2+worksheets+in+excel+2010
    • 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_off0000b57f.bin
750366caa533244c25e8c4ad50bd4b7dd3a230f92402acb377ce7fb3df4c8fad
pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 11076 bytes
font_01_sfnt_off0000cf45.bin
2bf17df5bfc12ca5c8b8ee51db787538ddc8941aa9cc79bdbf60f6a8180329d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 15148 bytes
font_02_sfnt_off0000f593.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 16792 bytes