Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c01eafabbfe4fee…

MALICIOUS

PDF

85.5 KB Created: 2021-08-08 23:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d40a8e15ebbe919dde0344bdb47cab2 SHA-1: 5cd78110e3631d189fec81b79d6d4f90e43ff11c SHA-256: 3c01eafabbfe4feea0706ed5382a8b38ce296987858350ef2c8841dd4143e44d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The primary attack pattern observed is the use of a link farm within a PDF to lure unsuspecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5acb079293136ac37c2f77505fafaced/75025043062.pdf In PDF document text
    • http://ztkammer.at/uploads/file/figagimev.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/judijujilapun.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9521d2ab---famelenonatuwojir.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bc923777105d396e052b39b3a50158bc/penukejonopilekuxiw.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/43199354767.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b801e04c6b---34377632660.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210530061619.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/piwexumed.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebef94e06f---8075749769.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/20862008162.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/aa87e27c802c87ff91172736888d5596/xofolumituzipivufuwolev.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6374fccb9f09f2639c493006cadedc1f/zorexiva.pdfIn PDF document text
    • https://soechi.com/userfiles/file/22567520843.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c908343f---zaxenabugid.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b151f4c344---nevebulinixekafubilegifu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b569f96e2b1---69747614245.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/bomisovez.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/36634430917.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/mefumibepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+ford+vin+numbers+meanPDF 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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 17168 bytes
SHA-256: 2d3147fe181a4e57d4dd9cbfef13392f4a58541febb5c88f494267b2f3d719bd
font_01_sfnt_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA3 10872 bytes
SHA-256: fabca44a5830ffcacb3b9d6b1d5f99bf0fd7ae63834eb1ede6cb8ae36663cce8

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