Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e6e477c29d8ae9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 11:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0152c7b45137736cb3c73cbf5540441 SHA-1: 3fe9fa671e2333f92f7ed13fa77bd4af80704ff7 SHA-256: b8e6e477c29d8ae9abe4ba318cc47ddfe31ba132f704743b039409b60e8579e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=the+right+hairstyles+for+your+face+shape PDF link annotation
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/kunuvat.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161381d4e79ec5---99044606709.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/besamedudakazik.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef94bf9dd---letubozipebi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131523f6e467---gupunuzuvusiwij.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/07/file/20210907_070948_108.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/40544345888.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/zeritibukevobeb.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/vapikulegixugezi.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/9461347423.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/navudoj.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fenizomug.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/68194161287.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/93551856777.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/bopefawip.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/gikubamivumorasaso.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/7349103819.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee10478b76---mexigimebegu.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109060236381999.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/77281455731.pdfIn PDF document text
    • http://foxadv.net/file/49874113307.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/71623682229.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/1797976663.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/67679984291.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/4015333121.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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 10832 bytes
SHA-256: 44f71b555b92e727fb570e7aa788c4a184cce80bafaf27299ccea4af51636f5b
font_01_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 18272 bytes
SHA-256: eb578eb2efae148844134b4f6235c92e9faa16347a0f1ed41dc2a396ab14e762
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1