Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18be247c89fad62…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 17:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dcfe095b8a12801b0958e7d19760e97b SHA-1: 2b785cdbfd1d8093171c25cd56c449612ca2265a SHA-256: a18be247c89fad62422540f5392037cf5ae7fc43c2c3abeaca56e138c0c8ddd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate it functions as a link farm, likely intended to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/6fifkrk7f7bnouf8u8suq7vncu/pijirodadimutajejumig.pdf In PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/15810007474.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/95415632196.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/85127b4db2cddefd930ba318bf626186/mepezuneduxupelizusamezun.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/rq1mb4bpir342lc66dv1vgkbu0/7181925781.pdfIn PDF document text
    • http://roocenter.ru/upload/file/19981495852.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c30ec8250c---29276122416.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b475725e1dc---wikasuxovivugijuvuw.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74466696cf---49648762836.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/76673073fdc9153c8c25ad41baaa8176/83054757391.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/rawakuwakatomi.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/gabefuxewo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/72195442342.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/59962017334.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/88433318165.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfe5217c57---74194199631.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/puwufosuda.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3afb3c786---43956788844.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/21545004615.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/nutatemerijusotid.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-25/20210825035824672953.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/52376624966.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2c442ded---32754679880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chrome+trusted+sites+gpoPDF 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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 10656 bytes
SHA-256: 302b88fcb1b144b0241d9dec542115fe17e6a61fe3c0ad98646aefde3e6afdae
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 17748 bytes
SHA-256: 6d3153f666a077eb914b3a1c5e00737b0874fa91007280dd016d5abb53558edd

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