Malicious PDF — malware analysis report

Static analysis result for SHA-256 a164791c678e6cd8…

MALICIOUS

PDF

62.2 KB Created: 2021-09-06 12:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 267a9acdd035115cacf17c6c2dc9e0c2 SHA-1: 92fd7508d2140f20513f94ec87c53a09de5d407c SHA-256: a164791c678e6cd83f2ba1c65acb17b8eddd56c684def7ccb5eb03691dc17bda
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for phishing or distributing further malware. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification also flagged it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8107

Heuristics 5

  • 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
  • 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://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d052a8d1817cfd9bed7a6dc1fe06ef9e/vifutasisobes.pdf In PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/mepodulaguvegimamedasir.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f20a3ba5---78598119296.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080509df3304---39663723142.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/fopelu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5afc9c883b---mararovupiv.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/perupiwakoxeberovo.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608006e20c337---19323148634.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f432dddfd70---gazowabamelop.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///dejiziba.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/65501651503.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/xolubuvutokogomenu.pdfIn PDF document text
    • http://potlista.com/file/files/83902227274.pdfIn PDF document text
    • https://ptogel2.com/contents//files/15249136413.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc29bd558---xasunuzokumivitav.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611225c8c9f28---lupijixak.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095aaa19b5b3---dovabowazixuxuxoma.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/17041746495.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd284dc84---13475877335.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/dozuniwikuzixoxodep.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/nanebafuwaviledunuv.pdfIn PDF document text
    • http://4bx.pl/public/file/gegagiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=codigo+penal+colombiano+legis+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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