Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf0113406d9cee2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 21:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdc6aa5493fb454b12a4bfebf85514b1 SHA-1: 12eba9992f12497fa501a05ad20de9dd8f232702 SHA-256: fcf0113406d9cee2e8e4d4dcf48f4e45d4783ae756383cb24c77be431eba3ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that redirect to potentially malicious sites. Heuristics indicate it leverages compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=samsung+washer+dryer+combo+repair+manual PDF link annotation
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/5e2e5098f2a522b3d2094732b6a810c3/70977560914.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/91045139050.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090a2d94c2e7---30771563908.pdfIn PDF document text
    • https://cargotavio.ru/files/file/92035539497.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/9fdd90cfa54ba2fe3ae0e870833a48a2/dogutarurorobovoxerejusen.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210730045431.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/47426259897.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/pijisag.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/lipemurumobevagewatu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1aa05e795c628df74a182017b92d7d2a/fumofekupekegaledopu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a86b0d9bf9f---11286230353.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/41593993494.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/99391205713.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/6cnar33hbnsuc37a7laphoarrb/57693211360.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/64c0589a050655b9f7a7ff35bbf7b0b9/rawebinejobudosojusefo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f56b20c66e1296893690cb338d220e8b/sikowulivojorik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5613bd21---lubegiwozasinorivuso.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/posoposaxoweraduvusar.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/xojewigatix.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/retar.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/48437690152.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e0aa4bbe2---vaduvedefuxide.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16129204628af3---mefaledag.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/54998833758.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/91433880569.pdfIn PDF document text
    • http://lblussana.it/images/file/17234439053.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_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 17236 bytes
SHA-256: fffc2e5d44a1dabfa12f3e581f229d8e0f581e62a7a0e544eb88af05102ac84f
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 11376 bytes
SHA-256: f1d772164a38cc6fc75c9544790ec2008c5e260b35b522b0d743cdf91444780d