Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4da23e5f4629fff…

MALICIOUS

PDF

78.8 KB Created: 2021-07-31 03:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fda8504d9da1043ec2c3c73ac4a19f3 SHA-1: fc0225cc0f41b67b90e1db2facf989f17e7a8ff8 SHA-256: c4da23e5f4629fffe01530f38121d7f9113162b0ead551d6f07e531c2be59b5b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The presence of external URIs and link farms indicates a likely phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/21740ddceea1a65acee4735f2830a93b/padukimipalidafa.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f345d48e---45916348144.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/52790629593.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f43c520385---tobodovoke.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/nirugupu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e7a7767ac75949bb0002f0a34a76651b/60385498072.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/fifejimefipi.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/dabukusaf.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dc8573520e690b1cac5659ec485e6503/7192171764.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/54061821173.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/01k6loa2tg3vjt4l148lqe4hhv/vosumowom.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/98554756940.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/lomawarejaw.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/viviwekebi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8bcaf850---90830575402.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/600805394ed19e44eef2cde1879b7580/62850172850.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3423e70531530ba6b5b91b1f4523e025/35831111090.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/boxifisuzibofovex.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0d85c86b---fikefafabipekem.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/51091468156.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/rusala.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/39224614911.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b896a88c2208e10e742f107af940923f/gewakonenobom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=shirdi+wale+sai+baba+hindi+songs+mp3+free+downloadPDF 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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 16960 bytes
SHA-256: db671d65a9e6cc1ac70b197ed8d4bd0497ac02557be7b2ae6725de9d9726185f
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 11320 bytes
SHA-256: 9357de0ae51d66bc58aa41a2d670855465f7ac7612716d51382f2ffc9a46b4c2

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