Malicious PDF — malware analysis report

Static analysis result for SHA-256 2709e8256830a2c6…

MALICIOUS

PDF

98.2 KB Created: 2021-06-15 19:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 25782bc606f648bb42d83e0e0f6b86a9 SHA-1: 71c2977761351db3c5392a2649c13d2403543fd4 SHA-256: 2709e8256830a2c682c572baa253cd76a27bcf57290b16bb3e589ef48edaf2db
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to academic material, likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/uplcv?utm_term=wooldridge+introductory+econometrics+7th+edition+solutions+pdf PDF link annotation
    • http://adance0112.com/upfile/editor/file/makakemogifemeno.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f4e5bf59---5871311165.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/16e13a5ddf4db0f76b914b82d7debda9/taxoparigexumeju.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081713f0c9ad---zewawen.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9c3981cd6ad3eb4cdefcbac9cfb62dc8/jipujo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078811f3acf4---ximorisuj.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e5ec0fcee6aaabac2a6004511f38867a/6404319933.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160792426a749e---40662435206.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160acace4a182d---foxeseveji.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/0bdb1ae19982fcae2f85014f412900e3/72637934416.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd0f180fc851f8c3ab1c1586b7f4584b/sefodifurizenefaj.pdfIn PDF document text
    • https://bursac.net/userfiles/file/13036274499.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/paduduwewoxuforamis.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/45048967600.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a945936e646---90225157516.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb8300a98---senivubime.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df30f3493c---belipifuzidilagog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 5556 bytes
SHA-256: e52f0642ee0cfc48f969f6ec2be1dcdabee1eb58483831514af42da16cd7717a
font_01_sfnt_off00013932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13932 12680 bytes
SHA-256: 2d6b0f21583407cc00fb6f91a1be4750d1b0b364d0bd0d1fd3b71dc2a519d375
font_02_sfnt_off0001641b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1641B 16596 bytes
SHA-256: 0e56f209b974c847a09444322e8c9f330d60374094bf9bbd8d1931e47b1409ed

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