Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cffa3d8a9374e3…

MALICIOUS

PDF

64.9 KB Created: 2021-08-31 23:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b270a2f82a0bc8934b6accba30b9380e SHA-1: 401260ca61f29baf97162f288428ca0e4ca8fd2e SHA-256: c1cffa3d8a9374e34dc37890d2c696007e2ae131d3c847e8644443fd107ff534
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised websites or use disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6753

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 http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3fcaf25cb5c28b61ffaaf81680443d21/66295480867.pdf In PDF document text
    • https://mvservice.it/file/37687938086.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/adda9b3d053069ba5e9b1cf3b798ef67/kejofesewazaratevelakasef.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/73017280780.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/zufapulofufubilinosep.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d4593c38aec---semejigupu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5e9da17f---91109008551.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82bbef032---39636866390.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c504dc80d50---26572361248.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/kolomerivalovikeze.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/85934503904.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b6717f3e---7337262387.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073a4179a250---gogijediv.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ttc77ou4k165fnu6onueqr29br/rudiwozobupegejaxetakefoj.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/146be2e28471b9f4b95145fb50133249/93013639290.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/egfmfn68qvjcbl6bua4e2qq9r0/41929729418.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/raxewidedixan.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c908def28dd---97895050007.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e8b864db---kutew.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0067a3788---femeb.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/sitogepegavedugesixagetu.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/lofikagelatobife.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/pizazazumimo.pdfIn PDF document text
    • https://4appsoftware.it/file/43265924438.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/90055473620339c9e1f819b5bc6cdc44/tilexotazuro.pdfIn PDF document text
    • http://industrialdevices.in/uploads/30218177780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=anime+body+pillow+minecraft+texture+packPDF 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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1