Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e676cdefbe2c4d1…

MALICIOUS

PDF

112.6 KB Created: 2021-06-10 03:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eb0a5c96556261955173472eb793849f SHA-1: 2e7c6df81072adde8d825ef2e34304a3c75b171a SHA-256: 3e676cdefbe2c4d137c368a3654ea8428a868c864f92270c19a09de1991b7e61
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=wais+scoring+manual+pdf PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40152f3773---52069700192.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6pk5u6qelafngef8kl69f8a5hi/vetidus.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe34e9a1a---93048022143.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9c4adc80---xerobaxexazafukawusup.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9d0bba45292c5878ad5d349165880c2d/78400473444.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/911e51a287f8c07eeb80e40dd3fe6f27/98462852504.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6b955bf3e070506e76af1aff202a057/77520782183.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5f0b1450---vudesetadasavuza.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/xokunovu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2b6881eb---ludizofefunoxe.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/nokixuji.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/60203667740.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/cb3c3453ae26db6ec6729b71ae122cc8/mitujizinakezinotog.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e5fd262e6---rofarinagul.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ee54n22mie2ogsaiq5492i5jc1/pizaxosezowud.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/laburezimugetolutelusoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17827 5488 bytes
SHA-256: 52cf9552daf6b0ab874cddf5a7e38e69823fae90b4223e68552182d7ccd5aaa7
font_01_sfnt_off00018ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AC9 12520 bytes
SHA-256: 5a084218b55861a8cc94e469fc24d71b9b83f0a133f39e4024135078ff32bced