Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af6055a4e006432…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 17:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e6640bf3a77b2af230811d8a9f87e5d SHA-1: 251b64260082ecb9c679559aaec64bfc6b3ae380 SHA-256: 4af6055a4e00643293637a5e66c17ea0d20cff2a7de3cfe033d4fed70410f737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary attack pattern involves luring users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=bikini+body+guide+workout+pdf PDF link annotation
    • http://ip-golubev.ru/ckfinder/userfiles/files/tagegelugonewadenoj.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8b1dbb4d6ebcc3a2b424d7c07d78da6/pukujenugakanojekan.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ce998005b8fe18da1000162e2e1edb49/sebaraduwasum.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16115c3924ec42---97387444134.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/radijatesinij.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/130c453e85debba6bbf80009f2df807b/kebinawa.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/32335354611f3e9066f03.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/jisubude.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f466cdc9a3---megebadewu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/sbmnmhf9j7fm120usus0uk3ig2/94244810877.pdfIn PDF document text
    • https://wecareprogram.org/images/file/sujijefe.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/fa5c6c62442bad2196bfe98e839563b6/88337310592.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16118099bb6d76---14424644809.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/18345474710.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b69943c67---xobazezafidupuridedup.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/suwekufodavagezolaw.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/70932607748.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/56233341662efa4d3c251678be16788e/dikiwijowivetu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/10385ae0404451bc2810a5a8ff29e857/70477940312.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/89876570025.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/20981696786.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/52416450128.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/91245121566.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/5113426449.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/6ejoqk2qs0vvrc61s9ufnqar1k/2641368502.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_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 10884 bytes
SHA-256: 8eb73b8fa64998eeea7f7149325ce421e75b9beff19b3fa04d00283646789299
font_01_sfnt_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 16372 bytes
SHA-256: d0a0090ae6adfac4e82029ea894f19143ea7afefcd14d1426147239ee37f1593

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