Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca9ddba11c1323f…

MALICIOUS

PDF

91.8 KB Created: 2021-07-16 03:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef07bbd1fca9a796d3916ac781226502 SHA-1: 72cbe1d088c6930d5ff8f0acdbd8d61d0eb2b99f SHA-256: 3ca9ddba11c1323f0ddb32d46f4af47fb00c8bf428e6cfec72398e5f57ef8a32
96 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URIs pointing to potentially compromised websites. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts hosting PDF files suggests an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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://synerhu.ru/uplcv?utm_term=manual+for+courts+martial+2019 PDF link annotation
    • http://rheinmotel.com/userfiles/file/91128909316.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/gofibazuduzawakupakigar.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735bf2cfb3c---kewujukutupevobor.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/94883862451.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b966fa3af12---motize.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5ce4a1c287e4534ed746e92c2d83a30c/3995850201.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/20c98f2cb8ff18c0850003fa9253a1af/tuxaminexuponoru.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/504mq8guelgr8i1lahph18ui7b/37971193205.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb931d79a---57854594152.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6soalbf12jn1es7clodm3rgpou/legun.pdfIn PDF document text
    • http://apple888.vn/luutru/files/13334084879.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3cdb74d61f90746c7cb23ea7ae9e9858/54467774169.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/35643667415.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/rekemezape.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mbo883jo9s1hqnash0k06ml80r/fokelunuvuganub.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5f294342---jezonajotufa.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2e9f20dfe28264d334b3edbe7eaa7f8a/jisosafexil.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/juzekunuparekutorog.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b69cbaace01---donarar.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/wajipasoxarakipu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xedobolosimox.pdfIn PDF document text
    • 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_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 17468 bytes
SHA-256: 4402e12d99cf66ee585c37c971f2c0abd83ae06784cfd4bc8d3849d4781b9097
font_01_sfnt_off000130f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 10920 bytes
SHA-256: f2181c04227acc419e040d8843fac488a3750b00ca8ed7583c93b6bc682324cc
font_02_sfnt_off00014a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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