Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1d07c541b85950…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 23:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8df7c65844a224174c415e57867cd02 SHA-1: d901418899bd34369fda1a5639f82abcc8ed3220 SHA-256: 5e1d07c541b85950511c304335ebaea2c4d5f74c789409a8cbd05adce31feee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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
  • 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 http://www.vikingmaterials.com/img/lafategedufoporoxibok.pdf In PDF document text
    • http://ac-kenigsberg.ru/files/file/58831274332.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/zigeninufibomowukosopobes.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/nesukogaro.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/69398097567.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb16bcaf5---21768235519.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/15201786898.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rv8dui66mlm6vppdip2da4aj61/digidu.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/nevedubenun.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51859ca62e---82401013887.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b42097bae5---nirurusuju.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/xekokodivelafikepo.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/75250668938.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e168f395a9.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/75778555067.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/50836812653.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/76972218797.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/lotomodanex.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202108140705425897.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611a055f24f93---zaxadekurowakizidek.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5etbjiosncrjd9tfp5amb1rrql/32293709993.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/wusoxilopavuwu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ad64a3475---64209107992.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b813dde0f---69043026755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=classroom+commands+pdfPDF link annotation
    • 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_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 21132 bytes
SHA-256: ee42d651787e5a216f3aebf3f109546be6587c43cd62cfda97bd9dd2993b2ae3
font_02_sfnt_off00013a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 10492 bytes
SHA-256: 67928417bdcfc338b87410d5a9e831bfa6971088a80bf991dacbc4fca0d48a6e