Malicious PDF — malware analysis report

Static analysis result for SHA-256 84761e1b2eb9f231…

MALICIOUS

PDF

64.0 KB Created: 2021-09-06 15:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75884d6c8170876f8e426834bca0d247 SHA-1: 1f746f4a34374a03df085d5b83b90320ae6e6734 SHA-256: 84761e1b2eb9f231eb4061ddc8549279c39f4cef2671cc846c06db406c44f480
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support a malicious intent. Although no scripts were explicitly extracted, the nature of the links and the detection names indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6906

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://chcial.ru/uplcv?utm_term=lala+ramswaroop+ramnarayan+panchang+calendar+2019+pdf PDF link annotation
    • https://banghenails.com/upload/file/46067317075.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/zikuzomakebiwisipe.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1d55004c6---xoduz.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160945f5f09c13---99756165725.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9563f8b91e---89671483346.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/berujiwagobuxaxevibola.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078d63f5172f---debop.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/89937394768.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/zesabewutifarubojuv.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/71512d8a04349c69574a20143e14ecff/zifumuromedag.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16094a06c4de22---fobigodevijuv.pdfIn PDF document text
    • http://kgmda.com/upload/files/pijidete.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/foxofakagadanarexinafedo.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/10160101862.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/lujugovelijuvunexixuval.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/sazamujofuri.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fituvotokovuvibezodarobu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/19508314246.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/sirawivutawa.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/sazotadesitaveletepefi.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/81574653652.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mevusupijuj.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/pigezemufibukasabaj.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/lefiwuv.pdfIn PDF document text
    • 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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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