Malicious PDF — malware analysis report

Static analysis result for SHA-256 452736c0b6d2e15d…

MALICIOUS

PDF

92.1 KB Created: 2021-07-25 20:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bff1bb72718436384ec3f1d0823a593a SHA-1: 09b50965d09f8d30cd08ea2d3c31ae2ee7faef80 SHA-256: 452736c0b6d2e15d50382ddb6126be49c8f7c9936fb6fb463af346c3b5c881c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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
  • 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://x-software.cz/data/file/vujelevuvewipetopu.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/50156815861.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7481315650.pdfIn PDF document text
    • https://orrizon.ru/images/file/nezezuguwaloxam.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mapixuduzalukelomoxaguje.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210717_7FA2D2295B9FD42D.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74ced69d8---pokixugalezugujanegi.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/56420509010.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef9acba07---82599392788.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/53276797307.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/82245370331.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/fomoliliduluz.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/tivip.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/58955092546.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e7f84862ede---gewojemebi.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/gutumewozivizijavemon.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b6eb9e2e9bf7f443d2549974a2175021/64095079877.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2d46552f---29171197937.pdfIn PDF document text
    • http://teknis.it/userfiles/files/birowoxad.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/eifeng2j51hjl7tfma2dboc26l/89641111824.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/64768649028.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gawujor.pdfIn PDF document text
    • http://polkovnik.su/upload/file/85413551025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+measure+volume+of+cylinder+in+litresPDF 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_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10996 bytes
SHA-256: c5845a34ed17bb009cd5e46b29eb64f3ad7682819eaf084f11d3c4fa369cb9ec
font_01_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 18272 bytes
SHA-256: b9c5c54127b3789de2c99de8069c4c083830f93c5f061b84fb90945176750045

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