Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43f0c292d30c2f7…

MALICIOUS

PDF

99.2 KB Created: 2021-06-29 19:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7d8c928171edb7fe17979f9e3bedfd30 SHA-1: e485a5cd48bbdf9109d087be0c0513851da8c353 SHA-256: d43f0c292d30c2f77b531fcfa3b8895754ada9d037e848bb481d4618e6b21188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://crysiq.ru/uplcv?utm_term=electromagnetic+spectrum+relationship+between+wavelength+and+frequency PDF link annotation
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609caa2325995---68317163923.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6e401f0b5---94500765120.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086de8dd91d4---bilawofulalilinowub.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0c361a9f---46086428361.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081afa6855aa---tavoteledidag.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/57793634778.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/agnf51d7obq4pcoin6unsl0r85/23989800981.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d61a3fd1---janoturigamusizivuroxozo.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/91096739948.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1o1b30bo3k1n73b5g6a02q287j/suruxebo.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/kobomemiwinesafoj.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/50422329334.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a48940367d0---79807259019.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a912d2a9eaf0d0feca2055d1e964a2ab/50105089785.pdfIn PDF document text
    • https://dpmceramiche.it/file/bumuvoxorixepajeluzojejej.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5d458461---tenexotexagumumazoz.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c4b14634b15703a4b8cb48ad287b5d9c/turazemevejilukiwo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3f3aef26---26736526976.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51f6a74ce---rabibojiraseloxotivoda.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/53288970530.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160926e1493a74---juxivo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0b6e1b47---guviw.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaaa56571e---82467594621.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0a179c0a1160483874c7f02046715e02/36871529601.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/767e6643e55b3768c6db99ca315bd849/76422647423.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_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B4 17152 bytes
SHA-256: 653863b93652ad7601f8dfcc44ea8c82276431f8549be5c8df5d85b9bd50bf29
font_02_sfnt_off000163bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BB 11700 bytes
SHA-256: e7d0049d08c95c76293d65c2cf82878dcaa64e5ce6b875df0c8b7b967b49ff4e

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