Malicious PDF — malware analysis report

Static analysis result for SHA-256 792167faebec9a90…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 15:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55ba78a0244afcf33c44b643d536e169 SHA-1: 5cf9775f5ad4402ad575d1e390a2a3f1da7d37ea SHA-256: 792167faebec9a90801adc9d1609020f59f4be894bfbbaec9cf6e697c36a5f6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and points to compromised CMS uploads, indicating it functions as a link farm. The presence of embedded URLs and the overall structure suggest it is designed to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=mobile4pc+soccer+download PDF link annotation
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/manopenufov.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nozajajalaroturul.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/jomekodapuxojuxo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/tarovopan.pdfIn PDF document text
    • http://yjccnc.com/upload/files/navir.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/83687594259.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/49410733870.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/midovobigefi.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/65982086056.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/48312063218.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vozojirolotetafifufus.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/nijifajupapile.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210907111900.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/goriwitugepiborotekajofo.pdfIn PDF document text
    • http://iwort.de/userfiles/file/nawumabugezapigubas.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tejokidiku.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613356fc9b51e---83258747130.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q9tmj2u0cjhogmca4nlaq2jrv0/98797265495.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4c5c95b9c3c890a352a1ee5b45f45b1f/93518656852.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4674add4e---zotuwi.pdfIn PDF document text
    • http://llux.vn/uploads/files/54166983982.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/batir.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/477798bbf3a28f6de0758d1f8ebb5734/titiz.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/74765654515.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/relatiwisujo.pdfIn PDF document text
    • 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_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 18304 bytes
SHA-256: 3e86bda9d95f04c036f8ba1308cbf04bf57dc3abb95212b7722bcaa1dda46e16
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 10704 bytes
SHA-256: 4eaa7a61c6a7422b2f1785ec470ce0fe22744254a513ab809233f6252ff630a7

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