Malicious PDF — malware analysis report

Static analysis result for SHA-256 b949f3b2ec38723a…

MALICIOUS

PDF

70.3 KB Created: 2021-05-20 21:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3406c5f2af63e83f2a12c315d85f1b24 SHA-1: a5118a62bb8b8046768c6f1f9addda018a103841 SHA-256: b949f3b2ec38723a0d9b362b2ea56f4100b74c279982e36f832063cf0358605b
156 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests the document is part of a link farm designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/s0l63fss2g1g2cgu619t41r90h/95106032076.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e5db995893eaca2071642d832f42fccd/7077817226.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/601edf32a38388581cc4da1fe23b14d6/goxufi.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/dd2e80qbb1rv71cv5c04kc3c11/sumizixavojisebezas.pdf
    • http://adamlegal.com/userfiles/file/tumilitemelow.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092efe769aa8---tekodemokitanel.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c57b9093925be54fedcba1ec5153772f/50934109325.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79eb187f---kurowe.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609295658067a---nuguvuluzixepabuboke.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/841c1697d851c7ea0953fbd68b9a3e72/mawupovowimutubexoxifut.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875b7838af---51176137940.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078669d01664---94937597518.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3edc0e86---218177166.pdf
    • http://mppscstudy.com/admin/usercontent/file/zunaworozazef.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/61ae38251bb997e6d684fded3ff99d43/jepuvimare.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h3b7aqt0rgk2ld8a3m6cb6fj81/lupibi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=propiedades+f%25C3%25ADsicas+y+qu%25C3%25ADmicas+de+la+gasolina+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84a.bin
7fabe454fa4bd5dbec9b622e3bc3f1521543bb4f47e60f76bbddb653a9c4d8b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 5756 bytes
font_01_sfnt_off0000ebe1.bin
5d06423ab38fc071409f8b8581f19272a1182b563685e14752c7678b498d2903		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 11844 bytes

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