Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8bf456da7607dc…

MALICIOUS

PDF

87.9 KB Created: 2021-07-14 01:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 996af4156256d63e0774a5419e8256b7 SHA-1: 8098da3ef8335b7f09ea7a6b901f772eb966acee SHA-256: 5f8bf456da7607dc359581d931e8a639d4b231a03b50cb5f74b7e2abd583b94a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The presence of multiple PDF link farm heuristics and embedded URLs strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=what+is+the+difference+between+a+gravel+bike+and+a+cyclocross+bike PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90745eb6cc---24308836452.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/guxabesupuzamidiroli.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sowig.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/jidox.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8ede1147---56697349913.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/roxagosa.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/44669666762.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e7f3c6f25---26130108423.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16081881652e4d---82603731707.pdfIn PDF document text
    • http://vinmexindia.com/uploads/88849197143.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/47433559837.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/cc6dfbec7179408d3b0ab6457420bb93/49629761261.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c112cf923d2594db05f6a72e12888b9f/924399738.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba6d5af01c---82356063846.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f788854413---tikixozinelaxapofisad.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfee8a31e5---44642095014.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/butor.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/42783281909.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/84853856039.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b4222917566c02e682b89b71b2efb999/noxotevolotuw.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d1af7eaf9631e64655a676ad0bce4a87/bonavijiriv.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6edb475615d1df4dd5f722eff79647ee/miduwugutepemosi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 16836 bytes
SHA-256: 163312f5b81e0be9f596dd4e28c171694a4a86669661f35fb16c07ac313e4674
font_02_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 11248 bytes
SHA-256: 304d5c92e44ad0f04d7b39b5c87fdf45c3309138483760270c35fc0aa4da7121

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