Malicious PDF — malware analysis report

Static analysis result for SHA-256 75352438f1941e95…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 00:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bd8bf32c51f08392d69cef22866dffa SHA-1: f56907607a59e533649d85321724d4f6f80511c7 SHA-256: 75352438f1941e956c0e0a6583319afb5787f4faf06c255b1e10da6089a765d6
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised WordPress sites, with a high ML classifier score and ClamAV detection confirming maliciousness. The embedded URLs suggest a phishing or malware distribution attempt by directing users to potentially compromised domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ede3da070b06d5ddab6ced1e1d475b0e/zifiraragisitisexanukuge.pdf In PDF document text
    • http://irvine.songhakbbq.com/uploads/files/sigofogitadiva.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/40e34a0511dc6eb4f931af7443c9b984/75283540679.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090600391073499.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/81360334508.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/pifezosugoki.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/takefomawi.pdfIn PDF document text
    • http://moretonassets.net/userfiles/rulereweropejosegitutaj.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631495062.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/51366149153.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/xonagolamom.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/76876054438.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/imvq5qr7nchhciedaakurkn79e/zugagur.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/buzoxivapet.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136479e34936---88460824839.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/gelufewovuvulosafedilir.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/51662350088.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/4812488532.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/ribugawinelesuf.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/74094041943.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/tupupopamidizodovenaxe.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/69873321926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+textbook+appPDF 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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 17180 bytes
SHA-256: 2307059e0b2e52bb44396c526cf5107d6f02f60d4667584a83dbb1762a3381f0
font_01_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 10484 bytes
SHA-256: c2dc9c5651c6807e6d20597ec5c9f7b425c2a218bb9f0d2aba0c33f1a9a88baa
font_02_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1