Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b21e89c4d31458d…

MALICIOUS

PDF

81.6 KB Created: 2021-07-28 10:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 41e0333839b2a03f44b67b014c84c501 SHA-1: 0cb8347862785018f7cd49cbc6e91ce28bf27078 SHA-256: 2b21e89c4d31458dedce08bb264b1d7624de7a64e1907310fd6d2421549ddf9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple compromised CMS upload links suggests an attempt to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gabinetpro.pl/kosmetyczka/krakow/files/poxuxuralapipapebuvujab.pdf In PDF document text
    • http://ukwoodrecycling.com/userfiles/files/81417299272.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/13644642973.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/13252279791.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf747c63f2---fepopolaku.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4540f24b9abd68aecc5cb33ab48d4579/puruzozedowubaromib.pdfIn PDF document text
    • http://pneusmarene.it/images/file/57412676930.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b9148b533---rugozowiboxevovulab.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/budolulaba.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/gabige.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/tepawel.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d888024a65---5175089259.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/xipalobadaginelade.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/loxeluxafob.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/83n0bfhq6q2gugv419psor05lo/kexawudinipimalorox.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/90682887276.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/95590694184.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709aac5befc---42499574280.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16096b33eed498---43701263577.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/vibiresalenukekaweg.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6b55a42d457a390378d67396c4ba1855/72647453832.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/66905612818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hamilton+beach+18+quart+roaster+oven+ham+recipesPDF 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_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 11344 bytes
SHA-256: b1c7a55e1c612f20f6339f8ba29d133d31699475e0ea277605578827431636f8
font_02_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 17048 bytes
SHA-256: 1af8a69db51603dcd2a9eeed72ef420dbc2a156c9d22e7f9af47850971274e3a

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