Malicious PDF — malware analysis report

Static analysis result for SHA-256 91679299dc291bce…

MALICIOUS

PDF

93.1 KB Created: 2021-08-09 06:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a018e8fd676f6b9d07d42c6d1945fea SHA-1: b637e7afd15f84ee8f2e2587ca94b07179656b68 SHA-256: 91679299dc291bce5a84818a65665834baf43100b871354da1672caf0a857fd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://inwebjor.ru/uplcv?utm_term=writing+task+2+ielts+general+with+answers PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/33a9a3272b3897425c760fbbe1c96f43/rajomegitadir.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/4567304567.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f758014bdc---27514378978.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/mevomemurobisugofokoku.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/dexekur.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/deb0b959ae1d492d7e11069ecadb0c77/14370341618.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/70464757534.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a275c5b2cf---16160807003.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f998ec4883a117569fbea1918a75ad25/gibutulapugoxenufigivo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c37d57577---53175603057.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/gufasabexafanosivinugim.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8f437e66f92b414447ea4b296d91530c/53959196019.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6eb92f12---22520349716.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/12526973581.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/domuverizamojirozamuxu.pdfIn PDF document text
    • http://cecev.com/stockages/files/xobaxul.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/joxugikuwijavotevasupuwa.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/56554705835.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/xulumikabuvokus.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lc1igte716dqvua10gipbsc07h/mitikeboridovepefepenaje.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/56c553173eeaaa0eb1cf8f54c5b1baf1/35077409286.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/wexemekepunixabixobafit.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/49677774507.pdfIn PDF document text
    • https://promise-land.com/upload/file/tavumazo.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_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 10560 bytes
SHA-256: 2d8f54fcddf3ba2c08d66586e4b249159e7ef06ca071536001533830b72f8c2a
font_01_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 16648 bytes
SHA-256: 26d82a4e18f65bf0e239d1bd91b27211042a5878880b67b36852208028704ca0
font_02_sfnt_off00014e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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