Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0bbb9d5ca364fb…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 06:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8969706bbdd9e5bf8d4a649a07c1c8f1 SHA-1: 56a0c5cb1836c5ef5f68611057cc1bcd98f843e5 SHA-256: bd0bbb9d5ca364fbc0749de5c32719b48bb31383f1c13939dea0af1c912433c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites, including WordPress upload directories, suggesting it is used as a lure to redirect users to malicious content. The presence of a link farm on disposable hosting further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://technoarc.net/userfiles/file/pubowajetasususume.pdf In PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/vavidixomelorefu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/80140898663.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/85961913829.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64a036344---tijot.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/setupifutevexazuterimivul.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161450e4328dc0---62836181997.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210915165817.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d864bd3165b767c448d3da0544410d79/jabolunejevizupijoma.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613493fd386cc---9029650164.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/23263132754.pdfIn PDF document text
    • https://kueapem.com/contents/files/97460358398.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/wivujomeno.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/37558240587.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9a065b5d---86569103794.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/49721678393.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109070456443373.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/sukanegapezonolotituxuluj.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/fibufenujej.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/reropimepubatabefo.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/82133010126.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/lubif.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/66600874468.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2e3b42e71e7e7ce1980326423409486b/31228266727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=naruto+impact+stormPDF 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_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 10328 bytes
SHA-256: 282889850278e8b7cdcbc7ced3e651e08ab263d25bf74cb6134aa79eb572b54d
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 18104 bytes
SHA-256: 376ce23c92dd095dc556bf7d5c3ed3533707e696d7933439b33989db51c61c19

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