Malicious PDF — malware analysis report

Static analysis result for SHA-256 c421aa30f276a74b…

MALICIOUS

PDF

109.3 KB Created: 2021-07-04 21:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d1766b825e364218460974aa2d15901a SHA-1: 9b52a12b7c7a66734def38370c53febba370a3db SHA-256: c421aa30f276a74bf0ec8525b33110705cf7b43508d5608d0253b4ad2944db21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised WordPress uploads and other disposable hosting. ClamAV and ML classifiers identify it as a phishing or malicious PDF. The primary function appears to be redirecting users to potentially malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://rkmaster.ru/uploads/files/bikekukas.pdf In PDF document text
    • http://alpha-th.com/userfiles/file/nipibivivep.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fdafb5062---20202784289.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cbe116355d87a230059ffcfb1daf8032/xubevunirus.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210527020616.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb99baf22---bevepogi.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gilesebokedosufa.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/22748324369.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/nabamaz.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/mulufemaxowebufezex.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/93494565546.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/g2chh2q8r4ns1c23ql0dd4umb6/fovegugajupokivugekizet.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/77374025581.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/42053372.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/69833248804.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/59757695358.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0c3118a1c34bd2c5e617acf81bb66947/mobijupomanebatuweruditos.pdfIn PDF document text
    • https://atl-50.com/files/file/17446288007.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/folugukozekalejofimaran.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/jezorigat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b759aed2000---jujifiwobefididexitevew.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/777b0544434956de47d00f477fe1b320/zuferupiwuluxirikemifu.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a539988fa0ba55f1ecc0b8cd8b0ac774/49343311423.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/xalogomutov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=a+hunger+like+no+other+pdfPDF 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_off000143a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A0 20252 bytes
SHA-256: 9caede9f13364a8d59a3a969da289cd83cf6dfa103d35737548393dd35719d9b
font_01_sfnt_off000177f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F9 10620 bytes
SHA-256: 263f2337ef8aa96d9ce0b61c2d899b82442da1b13223dfc25a4616ebd5c534e8
font_02_sfnt_off00018feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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