Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca7a152e5b65baa…

MALICIOUS

PDF

70.6 KB Created: 2021-06-19 14:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6d007e9990b17c22c6454b2fcbad947 SHA-1: 07f46c140046d8fceb9346a5d249be05da44f89e SHA-256: 3ca7a152e5b65baa79532f21bc430928787131546082e09740e9f17276e32084
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the lure-based attack pattern.

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://huntic.ru/uplcv?utm_term=worksheet+on+present+perfect
    • https://advik.net/userfiles/file/givejekomajopixugov.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/aff7fe63f9981e081397dc2ac826a3fe/janoxolujojetutitud.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a435a63cdbb---56929088599.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c37ab8bb---58678317280.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2afd012d8f1576090c85f4cd9cd7d6b7/guxinojatawodimubirone.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/60047a2d02031e4fe4d3ae41fec8fa64/lewodejud.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cac207d880f563336d94741b2a1d4cfc/96290638514.pdf
    • https://antae.be/app/webroot/uploads/file/xugefew.pdf
    • http://busankid.com/webfiles/board/file/%5C/3874829312.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160816fb27b168---44780510298.pdf
    • https://jurad.eu/files/file/14877642527.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1f260bae---99808107338.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/us74b3dtr7uclq158enjpghbk4/44772877852.pdf
    • http://alnoorcity.com/userfiles/file/visojiw.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f76dba6f---xikukujeluvukejamuweza.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4eff246c---taweluzorelarek.pdf
    • http://dent-pro.cz/pic/file/jubebiw.pdf
    • http://fitviewer.de/files/file/mogixovuzarusevomarorim.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_off0000d693.bin
9d3a57003fb91fc3ed76d3d56f5f4c25b4cdf7874b5a4036423e6bfb36202646		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 4936 bytes
font_01_sfnt_off0000e775.bin
c968057854948c8340f839eab1d64e536c3b3872ea3b71ddd08eb6d1b3fdf75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 10564 bytes

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