Malicious PDF — malware analysis report

Static analysis result for SHA-256 de25a50d1ec83350…

MALICIOUS

PDF

71.9 KB Created: 2021-09-22 11:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 005bf0bc72dff4edd55db78fc4eca15b SHA-1: 098079166d547973a0caf6b6be6d2219290b7a57 SHA-256: de25a50d1ec833507e198c7d68a445119d2f5aa19e14beeccd964774de06cd77
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6738

Heuristics 5

  • 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
  • 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://royal-pizza.eu/files/file/zugotifowosasi.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132a01c302b3---78846742460.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee2be9067---26078181755.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417284f09bd---78617020836.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/10671904634.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/xifaremupejavo.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/fapajujazobaxunuvol.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/6950151663.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/97415921751.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614923a45a7d5---83567209504.pdfIn PDF document text
    • http://gestioniarmatoriali.it/mareleka.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210919_39411ED9AD175191.pdfIn PDF document text
    • http://vejwun.cz/images/85238121623.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/49016240510.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/47531709556.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109201809351167.pdfIn PDF document text
    • http://hainfelderteich.at/poromoxipujaxex.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/varerovufojuxew.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/xewebotalixapogonef.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/27390565621.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/33669920626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mod+apk+zynga+pokerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 10424 bytes
SHA-256: 04e4043708468828222fe9ea1b2dd4e1e50e471db1a191b1c514fa5e502ae46c
font_01_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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