Malicious PDF — malware analysis report

Static analysis result for SHA-256 86be06b8a1984331…

MALICIOUS

PDF

108.2 KB Created: 2021-09-04 16:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a3b70f4e3814cd3a0d12a2907fa0627f SHA-1: ec9606886fccdfa93c407b5b06ccde7d6d915196 SHA-256: 86be06b8a1984331659a21145fb9ec5f6a10c48cbebff0c0b64394c26b171c19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://chcial.ru/uplcv?utm_term=birmingham+barons+schedule+pdf PDF link annotation
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23381302772.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073d845bbbcf---vepoxuzovepo.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/goriwame.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zegebiw.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/nimufibopilevolajef.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3262dbb1c84490bea5430789db1baa0/kuxupubalupuzekowupe.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/5856179051.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/79424298436.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/435149226611fac49c9d5d.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/17929521606.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/kiraselipokem.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f0c7c029ef0814d89dc038b6e669a5a5/84768159535.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/buluseju.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/tazome.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/suzoxuj.pdfIn PDF document text
    • http://afro-safari.com/upload/files/17394237844.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/buxibebapoxazuveg.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/luwibosodiberonubadilu.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/63736564689.pdfIn PDF document text
    • http://riph.pl/userfiles/file/93785692815.pdfIn PDF document text
    • http://dytac.hk/userfiles/3490501048.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/wenugepuvilavazatagan.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/gutuzotolaganita.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/77673962235.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c13c43641fa---19313331778.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7e27284be7aeff7a873be7c7ea075b6d/xatos.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_off00013e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E28 19288 bytes
SHA-256: 542e99559817a22493ce821c076adce24ee3f3ef2b8121e20a406cdd9955b2f3
font_01_sfnt_off000170df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170DF 11264 bytes
SHA-256: 9538db88608f284c393b9880b4a03c7d3d011bcbd245f117b8bb1aaf0f6f28c5
font_02_sfnt_off00018aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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