Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3515438e98010e…

MALICIOUS

PDF

73.0 KB Created: 2021-06-15 18:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95db1f4072eec65def16d8bd4a914e76 SHA-1: eb2958ced730fb92f1be3833f2b60a394107693c SHA-256: ec3515438e98010ea80afa120b4d7422dfbe31cb93a950db51581c0baa2c59ef
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=comparative+and+superlative+beautiful
    • http://fitnessklub-impuls.pl/uploads/assets/file/kobodapodesorela.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/951095c28f08cbf32b1d96980659c09b/gebusabogesadomimizixufo.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91c4548c7---62649969901.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61a29a51b---raferedivoxanebepexube.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/122b7442a7c86cb43c9bee8071b8f138/46215528978.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ef64e047---3724478506.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1a1f534282a22a60568b91351efc502e/52439284247.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b9781601e67f08d9137a61ca7cd05801/42777848030.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6f9536910a5bd7a5e3d160f0e63f2c47/30172627127.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/28563121882.pdf
    • http://nandeestationery.com/userfiles/files/mekowakusirixukiti.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/luu4h8rtc64jgfltbq88ktrgee/vakegosotejo.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/f46a3ce772d07af6d2b2c94942ad1ab0/73043019265.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27dfc43bd---41387767012.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8aec811b764f62c70bf6f4f98fe6cee3/18667845433.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7c7262bd4605edeeac87f55c23d1dece/pagesi.pdf
    • http://cc-loges.com/uploads/file/rekusiw.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54594726b---35113638491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e142.bin
a842edee31f508284f7bd693af904350dcc0908fb8bff53f4582d1a6bbcb95bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 5292 bytes
font_01_sfnt_off0000f31e.bin
07e07b29be016dea71a78a37c937f7d2c053cd20a9c40a75cd46830f4c7ff3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 10588 bytes

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