Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f51267a9472a67…

MALICIOUS

PDF

93.2 KB Created: 2021-07-18 15:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23b7536f4a63a014e4aeffff0b6d612b SHA-1: 66f51dfdc259ea470f77b33329cb574f48e11405 SHA-256: 45f51267a9472a67df1a6337851cf4e36e447df6f53a1ed5ce5effd0804bcb15
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic firings and URLs are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffecce6151---jalemosasumebelavubo.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897d0e76b9c---35018528495.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a82b5ce7490ca509138d7d85b4cce879/fadepa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9205bb4281---kagesazor.pdfIn PDF document text
    • https://noddy.nu/images/file/44956846095.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/fuzadewodovoli.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160739a3560cf9---xoxisefikokixiwokolot.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/wulozozufoxuga.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d157f5a0a0ca13e00f31ea21225f844d/foligakuzevotijobipil.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1baa671afaed61f3b50f7aa41eab238c/63333940773.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50302622162.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/pavesoleloxaditugidud.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde310d9de---40790047446.pdfIn PDF document text
    • https://bhalakusari.com/uploaded/ckeditors/files/bepefojipekipo.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/23782281770.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/nexuruk.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/068740391efc9cfe287813ebb3b13feb/danirelaje.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbqt109pln1ub2pobrdq9f0rbl/8026163479.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/94659569988.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b26c36fea---47427937000.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0l1jc8v1hehornqs53807s075v/49431370287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hypotonia+and+muscle+weaknessPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/458eed3b7dc1f8ef1d48b50d566a8b76/69240326388.pdfIn PDF document text
    • 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_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 16568 bytes
SHA-256: 902172082077f72a8ba0ee4a7fbd9ce6da0ae9390154bdbf8172db70a21462c9
font_01_sfnt_off00013600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E17 10956 bytes
SHA-256: c24503ed665abf8bb717ff31d44a442d056e4fe71b8631d4c477a94ffc03838f

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