Malicious PDF — malware analysis report

Static analysis result for SHA-256 906f1d50f965e42e…

MALICIOUS

PDF

73.2 KB Created: 2021-10-01 05:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6578291210d5201e7fe7e618339bdb26 SHA-1: c7733ef8c54612558e02f31e17c0aa074be4eea8 SHA-256: 906f1d50f965e42ef26f62cca5a83cfe77b1cef450945f2c4287f057583caa38
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=soul+2020+synopsis PDF link annotation
    • https://everestart.com/images/stories/file/7017119430.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/29036835921.pdfIn PDF document text
    • http://sql110.com/pic/72487202455.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/motarenujeledabiwitusev.pdfIn PDF document text
    • https://egca.fr/userfiles/file/83929151231.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/21846455833.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/woxideripusiluwixagu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614177441cb8d---kefeta.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7b85902e3---12849324454.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/03/manexusumofo.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/libafenagojumanidama.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/87656240716.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/ginoserirumuwojobenakavi.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/tadereginotu.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/68909830135.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143230833050---69034053122.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/1754997401.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/63df5604513704b1a1637897f7c84ada/tubudebo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4ce2b2a29---68468721033.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/jutomufogumetoraxa.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/fobizer.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614a33a9cbcc6---xovavinigikegojekokoxiveb.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ecub009p5atpqsi0o54ihqmvr1/zarexajizenowexevugese.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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 19256 bytes
SHA-256: c571749857465729219807abe49e4bbebf4836a4757570d0a865ea0764d4485a
font_01_sfnt_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10284 bytes
SHA-256: 9fea328043b1cef9e6b38ebe33aa79b4b868172ed193b27ba222b3508542a6f7

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