Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e793e8dfdb99bba…

MALICIOUS

PDF

68.6 KB Created: 2021-05-27 12:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75c288e2a1e7a38e88e4edec914f3778 SHA-1: 2f0d9e09bd9ea6aea8967bfc553a724eeec454ce SHA-256: 9e793e8dfdb99bba899b46bd2e68cbb986bd9ae7345a8317be86e00de5d641ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised WordPress sites. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fd70633cda02210b583bac1366fec452/vuwujavonibem.pdf
    • http://boathousebrokerage.com/userfiles/file/rexikidipapevapunejuropos.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hsgrf89ve6ij7h4cve7ll1jve7/5597396212.pdf
    • https://noddy.nu/images/file/71774366014.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9ba58b05---11084228965.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608678a5833bf---78745175749.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719831eb201---34698831579.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076250ae4df7---42823151212.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a72c69b0e9ec06f0f12b625ed596ded7/fumexizoredesi.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c819a536de---kagesaxuxarovo.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5683db3ba7---27125855878.pdf
    • https://xanbiente.de/userfiles/file/49559565725.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6a84718e---pojipunolima.pdf
    • http://sahamit.net/userfiles/file/wusujidujuxosewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+gael+easy+violin+sheet+music+pdf
    • 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_off0000d005.bin
a4ce23349024c856b0a0a894be363c2031346410eca44e9ed9dbfcbdad81ed5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 5584 bytes
font_01_sfnt_off0000e2fa.bin
de88a7a2fd07d704e960b9870b5182ba5f3fdf29e2911d64979fd60aa3482467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 10384 bytes

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