Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2b99680c6358c7…

MALICIOUS

PDF

83.3 KB Created: 2021-06-16 13:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8f166e33fc0a0fe6f1545b55ff236045 SHA-1: 829c5c2c5b79791aea6c7a9d15b9dba3c6b8dec7 SHA-256: 8e2b99680c6358c706834d2b092d7fecfd6fd54eabfa4f54aa239c1c7898081d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and one specifically uses a search query as a lure. The file's structure and URL patterns suggest it is part of a phishing campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=what+order+do+i+watch+the+avengers+movies+in PDF link annotation
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/002cca1ef3dacafe23aadc78abc1ac3e/pajelurot.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/56937441792.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210613102807.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/fizimawusotud.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/8303h6peov57p8fbvrgegm9qjb/xurozemijewinirabe.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/soxux.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/zojevovasoxapexepevalujef.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806b0b37f58---literorefitobogabutuj.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078da3b2efd4---41838632742.pdfIn PDF document text
    • http://short-story.ru/upload/file/pipadewadekejexinolinutep.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/85280859111.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/ff65057226a21b0f4b1480fb2633568a/168634287.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/27755139374.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b225d561fd5---10793284681.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4ijuvi5pb0rchvslfc8tkqqulk/97081087729.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_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 5488 bytes
SHA-256: 72fd12c0bbaa7fc31cb4e8a13eacc3ca7a731675cf1c580377dafc029f02a6de
font_01_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 10940 bytes
SHA-256: 6113a3ba02a5c32cac70b4f4ceb33bb067b4991085126a9cfa560e65bc0ba4fd

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