Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d436dd233f1d46…

MALICIOUS

PDF

180.3 KB Created: 2021-06-09 02:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 38615c36022699aa1485016f79a0ae6e SHA-1: be0b4c833f259ad439661bd1f3798a98316fad22 SHA-256: 45d436dd233f1d46de41282ce28b29b40291d2d717af2bccac55fd6d9f3315bb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is designed as a link farm, directing users to various compromised websites that host further malicious PDFs. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the heuristics indicate a high likelihood of malicious intent, specifically related to compromised CMS uploads and SEO link farming tactics. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9741

Heuristics 4

  • 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 https://garglob.ru/uplcv?utm_term=physics+for+scientists+and+engineers+7th+edition+solution+manual PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dc6bb3cc---17098665100.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/19d3277a50630ba5ab27a57c22b6a3fb/92116806549.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac57a3d06---gaxitokimefanotojedowi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/19811362240.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b249e612527---lizotexofajalasedagezi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210529064629_178448346.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/267523fb8c660fe175deee00326ba7ba/35238111688.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa294b16c2---jexib.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/758da677f7138dbf04f762122f746df9/6934821959.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/fc928c8b73d5d86ddb736f25501e4bb6/gagizerujaganokiwizefi.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/be2d4f064e18f61c8e87050c6eb81533/jodarawujoguwidubaxi.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/64251005f4d215b25637062a6a3d8383/lovosaz.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/pamelixu.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/75730063086.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/27079211561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B510 5620 bytes
SHA-256: 6b9d371ddccc3c2a62fa7ef1c3dcefd537dd062f8d5bf58ffcea744049d13c17

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