Malicious PDF — malware analysis report

Static analysis result for SHA-256 5042e4cc29465b87…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 15:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b11528dcb8fdc2004de66fe82491086c SHA-1: 898748a939265572443aa95bb66c98731007ebe8 SHA-256: 5042e4cc29465b87a8a96a61870d7d8c4f6a07a0f45e40e5fa791d8190cc4846
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to potentially compromised WordPress sites, suggesting it's part of a link farm designed to host malicious content. The presence of a 'Security software disable instruction' heuristic and a 'Password-protected archive lure' indicates an attempt to bypass security measures and trick the user into downloading a payload. Although no scripts were directly extracted, the overall structure and heuristics point to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3cc04d278f4d9b6a7774fff07f331456/6734189659.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5be2cb470---tipasibes.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/somapoxod.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/134f0f5e992b84e296a8a68b01ffb4e7/xapepudoxezevepedu.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/jisikexinoveveter.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/674f0f6c58d5a46c163ce4d0550fc027/vaverorala.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60a6b804e---vopijizovifizixigoji.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/10285062730.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/mavimoz.pdfIn PDF document text
    • https://schmitz.cz/res/file/90076134402.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/5518749238.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/gazalavegivedego.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb8cc41e20---23088193124.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/k1ht8lbh9j9vbc84sb7sukulc3/89082069255.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/10f9881286c284c1e66203d875ee2f63/xozalulodu.pdfIn PDF document text
    • http://envigest.cz/upload/file/69928931610.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be15bdefb2cb91d588196dd6dc2cf018/womutejoludasewokupike.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b61d419b---54354254003.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5248b34f2d---lamewos.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zagakewi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074baf50e7f1---lorezovejofojav.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6clon2i93v647s5196efh1gn30/39610395834.pdfIn PDF document text
    • https://amblamy.ee/upload/file/84415955243.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/22627563662.pdfIn PDF document text
    • https://reniuved.it/file/83938901673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=stronghold+3+gold+downloadPDF link annotation
    • 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_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 10468 bytes
SHA-256: 015f1fc64edf587f22ade910a8a9cb49662184f29035d4795c686e0ab7da1dd0
font_01_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 17912 bytes
SHA-256: 9c6535ce4424997cafe9bc6fb4f25156679c91dbb75df4b1d52c43762b4ea57b
font_02_sfnt_off00013cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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