Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88940492d576865…

MALICIOUS

PDF

68.2 KB Created: 2021-05-29 01:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5729a8feef5d02d8b615644c823c3b0 SHA-1: 58020770c5cd325cbbcdd21da20064d049085b4e SHA-256: c88940492d576865d0a27fd9b2c83fc840f6100d98ef8255429d502816c9a1a5
164 Risk Score

Malware Insights

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

This PDF file is detected as malicious by multiple heuristics and a machine learning classifier. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a link farm designed to distribute malware. The presence of a 'download' button lure further supports a malicious intent to trick users into downloading a harmful file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/37b96e82d0aeb6f03e3f55fbe36da433/80424917671.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105272231267318.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5cb0bf1b216bcbfef8be079bf029fa5b/pisatu.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fddc6cc3---kezekofoguwilonegeled.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b975dd5394---92846686124.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430094559652453.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/futif.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a365cbe43c32ef0714411f04050f512a/sekulexifejitun.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s2pditef4e8t28e2b3av16ipg1/23362711629.pdf
    • http://blackivy.pl/userfiles/file/74824890290.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16310ad36---sokib.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d0f507ef976a60847a62449944852f26/lusokuzikorepod.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085777b255ef---13108767396.pdf
    • http://adveotec.com/img/file/42644548002.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rio+2+full+movie+in+hindi+free+download+for+mobile
    • 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_off0000ced0.bin
df813797ac3587b99bea88c51ad6b58dbee3998919e45931c49632b3e38e51b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 5400 bytes
font_01_sfnt_off0000e11e.bin
b3688d6a2be353c7b5236592dfd30f9cd43cf0c86e161d3065d0b984bd51641b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 10120 bytes

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