Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e932c67736e9fa9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 11:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c7dc59a09064f9b03a39830fad42719 SHA-1: 81105e961a5808b68ce2f04ace1ace08819b9922 SHA-256: 3e932c67736e9fa97cf605398f4ad0bcf30d023fd41e7fee71989c69e0032cad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic firings, particularly the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggest the document's purpose is to redirect users to malicious content. The embedded JavaScript is likely used to facilitate these redirects or further exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6132994d007274e08c16ab5c7ce1233/jowuloweturagotizexosu.pdf In PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/1299446086.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0ec37708d---sopuviromusadivemeketed.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/dorutamekula.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/digovudiwotepa.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/daturujodigasowepigu.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/jilirasuxinigufefogos.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/43559811628.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f463210e73---97016348103.pdfIn PDF document text
    • http://cissi.it/userfiles/files/zozuxenuxaxusatin.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/85655221995.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/69712865060.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/dekipozi.pdfIn PDF document text
    • https://rosycaffe.com/file/dibez.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075e79d87507---50686443873.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/6291c9efcfbe184708e6d92815ddb25d/mobexotuviwerotaxilidetuf.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/zegegalazidopukawa.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/28086366219.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/fuxexusopajukadarotaverik.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/samefepevobi.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/18096579625.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/womevupe.pdfIn PDF document text
    • https://clove7.com/userfiles/file/50093858032.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/kotumupibaziluvabon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=english+tenses+with+examples+in+urdu+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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 17508 bytes
SHA-256: 00cc800b8e15805c83e20c93c658e3bd951fcf17d4abff837143c4fb1b24329a
font_01_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 11096 bytes
SHA-256: c8fdaf895ab65cfde6672d50b17e05af6a51c29bd12ca51f6c2e91107bd763df
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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