Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd92fff6e1735568…

MALICIOUS

PDF

83.0 KB Created: 2021-08-13 17:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fd0f590335986958238cee5bc4ba101 SHA-1: 9314ab9be9c23381b4dc4414e2d912bd08d51c77 SHA-256: fd92fff6e1735568203a7b924a3615e3fd635491a3b99a98e464ead9b13c08f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute phishing content or download further malicious payloads. No scripts were extracted, but the presence of multiple external links points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=how+much+can+the+tesla+pickup+truck+tow PDF link annotation
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9ae3ba87990877b1836bb3731249269a/22587508189.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc8a23ee7---91624168968.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/vukozetodusozida.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a81125087fb---22023015505.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/126004654060ffb4bca3fcf.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rog4efd11rj4ms9qjcdnsmbph5/45525421192.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/riroderololot.pdfIn PDF document text
    • https://agermag.ro/mm/file/99463036082.pdfIn PDF document text
    • http://altinay-law.com/images/file/zowazajukegepe.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/28015430226.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c42548f15f54828e697f1882854f906e/dejagidirodiwito.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/ce8cf83df04cba5213d4ca20f1703505/13102666215.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/kataxogarade.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3226c6689be6de838d6184fece11531f/84888192370.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c6cadfb8b62bcb35996d9f11b48f3540/veduzamowa.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/gekedela.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/e2de6f7685bb7a264b698fff3c09bbd6/38712295783.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/53868320377.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/57019674685.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859fdb39c48---xejawovefutupexojoz.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/65102209037.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7304559de4bec8b7d242808ab2ab3cc7/34675812432.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xudaniri.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098de081afdf---41937836627.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d0d4c8d95e5f2e6c312a88cb4579c12c/pekigenudelijinixi.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_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 10908 bytes
SHA-256: f8d7d2445467d8b70c2045806bce4c8cf7a9487edac9bcaea24eb00f8b78acf7
font_02_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 17784 bytes
SHA-256: cd5e64e7a4633184abd3e04e3539cf9230ee671b3e7556aa41101fbc9d3886ce