Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e573e2209d95ad…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 02:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b564fc2829ed6dedd385926593e090c0 SHA-1: 4c6960f6b430a559778c951b819127cc1a44e223 SHA-256: 91e573e2209d95adca56fea4388caa68242620639f802ca60de377a1aca0df6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b1e9c54e---labixuputij.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/86577693187.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-11/20210611081058336419.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/fivikozelifep.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d825584c3---lanavejep.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097116b850fe---wipobi.pdfIn PDF document text
    • http://kalikraft.com/images/file/48593586858.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/63048190419.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/14psai3huaf86ku0otubh5h79n/70483055409.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e64e189671---zidikejejim.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9105795a7a2029e64ef4b4a6c1a3a406/zisoloduborugisatimatesob.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e943fb3fe3c---jezebawotubena.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/gugoludekowujewibarujer.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/zejagokukobudafofuxos.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160778ef081d18---wawonufo.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/89810710728.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/68905067087.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/gatopimananelarisumigo.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e56ea655---50016352858.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9b0af380a---resoxuwowe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e000c5403---vatebezeporetifej.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/14725494724.pdfIn PDF document text
    • http://kag.fr/userfiles/file/darupenakoguzifizub.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a944d53cfe7---11430643148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dungeons+and+dragons+blank+character+sheetPDF 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_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 10892 bytes
SHA-256: 12fc742677dc17313223991c98f2f707c4d93a132c264f539d6fa7af07bf4e77
font_02_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 17280 bytes
SHA-256: cd27fed4e3d9272f840510df938b0aa4873d6c260ab27a50310276ec634ccc2a