Malicious PDF — malware analysis report

Static analysis result for SHA-256 db59b54f189cf756…

MALICIOUS

PDF

98.7 KB Created: 2021-07-18 11:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b524f1fa392361c68e758048e79a2509 SHA-1: 2396daa1ba60d7e80e9df2f0ae082344d64898d0 SHA-256: db59b54f189cf756250649d2bcc76c9baeb9c37a7c9f9c45b2a4ca10496f029d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple external links suggests an attempt to direct users away from the initial document, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/taa95k667le85qa7jtndgabp9e/rurevulenuvor.pdf In PDF document text
    • http://orhs76reunion.com/clients/30721/File/83494126689.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/68642467260.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/42024863606.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/rrvfsarta1cjvsu15dhs80ljc5/toxejenowuwege.pdfIn PDF document text
    • http://salt17.com/userfiles/files/79943012755.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918ad64b0b---64630417288.pdfIn PDF document text
    • https://badoza.net/userfiles/file/niwade.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e47fbc481eb56e316c05f29ab324a103/gilereguzoge.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/bemokebol.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/junonegilo.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/bujiwodaxesesofefopavuf.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/72c5934366d511c2adcf9cdab4d6ed22/daziduje.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/212b44f2ee9b0a05162123cd45592aa6/darilizoruwadugupenapo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/029c0526c8c197f98f0e9ab249690ebe/29827470703.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/8569d4b8bb855ca941ab56b1eee36357/rejesonusad.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/9nmufbmvb7bk8sfjkoqkia60hd/fukewegek.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608092eee1dce---tojebo.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/farinut.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b4fda16ac---72744709008.pdfIn PDF document text
    • http://babamoleskine.com/files/file/95129973481.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/2340496677.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///31225337441.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca58b32ad8---27275361910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=remarrying+your+ex+spousePDF 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_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FF 10812 bytes
SHA-256: f586615bfc0de0615df596e5c7b785c2cb22e44d06c6672537ad1eb7e4279af6
font_02_sfnt_off000150eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EB 17144 bytes
SHA-256: a64b2e335e9f4e1dec78a760193c45382107f0be4145c3544ad05c6c1521b209

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