Malicious PDF — malware analysis report

Static analysis result for SHA-256 87108319ba1163dc…

MALICIOUS

PDF

101.4 KB Created: 2021-07-01 15:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: fdfdf34c11897cd0f8946c6ad38870e8 SHA-1: 57098b8882f1d6d1f2665bccd86d965a27927bbc SHA-256: 87108319ba1163dc7edfa8bfe8cc8c8092f8f0b43da7021cc7b9338092963ef1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters further supports its role as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//58430931811.pdf In PDF document text
    • http://cartopack.com/Images/file/90433678521.pdfIn PDF document text
    • https://wagaskar.com/media/jezalimujog.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c39672690a9---49156988770.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2137d9e6---xufotez.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b164d3da6---favukitadenazuranod.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/vitedanetilosobitu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/72d99e71ceac434a5ec4ebaa1ce8507e/2075042711.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce851bbf3---87111977682.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46448ba9a8631002f04e71192612a7c1/xugepa.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/vabavajuzawusitexiwud.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/j6do4q379dl31rtavmeu2m2298/91605638099.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/suvase.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/82300188723.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/85434370639.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8b93f336---54666703501.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/95719891268.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/4ee4fd2f1b7774889634654e5f51bfb4/14336537409.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/dumazojazuxuloluvazumo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/medufa.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/214c08e2f58b096f4cebd578eb840957/95890801669.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079a03a17fe0---66517566169.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/6535692376.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1f69bf320073881c3c58117530ff3928/46615813027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=in+this+life+there+will+be+tribulationPDF 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_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 10588 bytes
SHA-256: 3f5ece17acb76f4e3a902b5cb4b747381cce7e4156a91f7ccd003c49c3750608
font_01_sfnt_off000141e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F9 17628 bytes
SHA-256: df7600fb670d05e40e2f99178be54b07b8219c83f230302afb0edcfbc4284e81