Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b8078b7b39e508…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 01:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44771011d73f2284db34b7eede1fcfe4 SHA-1: 186f49fa471cc108ef84ed8e172d77abd0589b02 SHA-256: f8b8078b7b39e508ce1b691f545d0436e45770bb87f0c3bc207f2f141f1f9afd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160742326d9601---jiwexuzotoxekilonup.pdf In PDF document text
    • http://alt-1c.ru/userfiles/file/bizanukojokepiwivubono.pdfIn PDF document text
    • http://megalaserasia.com/upload///55593857720.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2f2c8176cde3eb3e71314c846b4cfb5b/13352863699.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607291aa89597---54506417364.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99b0e8d78a---34689846288.pdfIn PDF document text
    • http://www.moyekolodin.com/files/32577284000.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/88540260780.pdfIn PDF document text
    • http://come2menorca.com/images/file/85670904980.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/54961305545.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/87196501969.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/wesutakatepakoxaxuxerinip.pdfIn PDF document text
    • http://chayka-svg.ru/files/rozofurojodexarunozididi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161139dc475af8---lafitidubisilenazisot.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160792426a749e---40662435206.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/60333707697.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/87167691153.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/19033475020.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2794b706c3eb3876492606549f7d5ee2/50147527911.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0nu8l0u2ckr1fbause2ohs6ouf/kagaburarekawanisuxetewuj.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/gefufagoxanixefu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608651e29b513---guzopokabonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=determination+of+the+density+of+water+lab+reportPDF 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_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 11104 bytes
SHA-256: 643f7b3ca4d0c3abfa0cd6a896955201e78b1c101b93c8a29f5c8d04336640ce
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 17084 bytes
SHA-256: 64146c466f93562770881665f9c29cc0ff33b972e79263c6049d8b9c96c87e8e

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