Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefa5080535ae2a9…

MALICIOUS

PDF

157.6 KB Created: 2021-06-25 18:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9df9d1492396f1dc93038194ca932aaf SHA-1: 8ec8191a44b1aa93ebc17fc40fed7efa503b3a8e SHA-256: fefa5080535ae2a961ae6cd63b96dc61e93aba7686d47ac042e13704b7a94768
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, likely intended to phish users or distribute further malware. The presence of embedded URLs and the nature of the heuristics suggest it acts as a lure, potentially leveraging embedded JavaScript to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://nomylo.ru/uplcv?utm_term=teach+the+child+in+the+ways+of+the+lord PDF link annotation
    • http://xn--49s538bo8ux8c.net/userfiles/file/difikukajekila.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bomelevuvukasafinafi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8ac40fe9dbb9eb25cefdeaad794e593e/2335782978.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adca1185aa0---kosuroder.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7f916891d0c39771918b9204c748766b/89884473903.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/42b000a14d54cd15d2ea3ed4bcbf3444/9716965388.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qj9sfsrf0boheit6scmpur85sl/23769033613.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fd38b9732192856111eacb38042ca039/besewokizeloj.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/rajilibikikod.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fac768128---28505629410.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d3a2bd20---12020963257.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084614698748---15885281213.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6ae9220eebe1da3bade033c7917cd8d9/fufesizebemebipifezume.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a632e6f65d3b31913ccfaebeabfbb84d/soburoxewexa.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/25718135168.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160807cc9474c9---92457686784.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd78504f4---niruzefa.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/tidedijekosodisiwuzukilov.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc81f3c62f---dadanuxuwolalefu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a892ea3fcf6---venapilupokutizarujawud.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/5677bf7cc73fb639b42a65e87bf6f095/83178007256.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/77ecaded8c548b5e0af93ad0c3ebab47/jozafufolem.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fed1868de---fufonakuwegoditinaziv.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10f75752778a5c99897276a6f61aa034/26656301502.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609166b51c606---77567614902.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE6F 22768 bytes
SHA-256: fa23d1fdbe826677ff74287dc295e87d7aa57abe3a09af7919fcad94b2fff6d8
font_01_sfnt_off000216b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216B1 10736 bytes
SHA-256: 1820f1cf1469fa074cfa8a7e0c7f9a83fafa586f8f03880d9c1b911c90f29321
font_02_sfnt_off00022f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00024771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24771 19208 bytes
SHA-256: 5e44ce411938787f43e9215ac703af74732863187a2771647d8049c0ec062ce3

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