Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7ba91bc13b0b6c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-04 10:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8266507eece8a78a8153a49f59f76681 SHA-1: 6a966a2b0235e4baea0d633700338f11604f2796 SHA-256: da7ba91bc13b0b6c507c45449c19fe30faa80a0fa3c104683eb7d994eb937bd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/c5f26c80203db0138b374eb8f17114f4/87794478836.pdf In PDF document text
    • http://grandinhr.eu/images/user/file/jixifatomemev.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/sotowol.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/66919340016703789b8a6c3b95ca0d1c/gidamew.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/nojuzotixojenimo.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3890ce263a523a6e5028be9361c42e19/43790206153.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/804f7ea77ef93e25814a02c8a80f9cc0/giwapada.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/vuxuvugeregeza.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ee7c23d8---52164487871.pdfIn PDF document text
    • http://fedime.org/imagenes/81612526960.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/44396931160.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/86766787581.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/sibamudojubupajowafo.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/69017192898.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/14029937300.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/femekana.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/40823447587.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/81417384483.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd7389d58---pepimofamosemoziwule.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168086cfc2c---90681718370.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/kuxufi.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/difibewixomapefaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=crude+death+rate+pdfPDF 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_off0000b303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 16516 bytes
SHA-256: 0bf8689549ddcc192f390ee9e04e784f03155af420d9015ba2a99624016d0102
font_01_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 10196 bytes
SHA-256: 7b6914ef79cf8fef95e567f1bd3fa5762fd3ef9f16790b7b52ac046aef7d99cf
font_02_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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