Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb7f65080de9b93…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 11:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5fedb52861bb71ea2007a86bb43c7685 SHA-1: 8941c9d34fb6a077af86e64476b994dc46e8f9b9 SHA-256: cfb7f65080de9b93e1b8983954ffeb34198f12f87ac4a07bbbe27c4d485585bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amrapalispot.com/userfiles/file/larexelajixodanes.pdf In PDF document text
    • http://paradisoseminatrici.it/userfiles/files/kuzibafoxex.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/xokikidetul.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/xofuguzadexos.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/28809202074.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b51686930fe---fobik.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936017c2650---33500072351.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/50352989381.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/d98g5s2tc27olkro4lqe114s84/zikitog.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/rolarevafi.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/wivibazifo.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/64350991530.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/76158645677.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/nobav.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pivimagafifesosexosipiv.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/48512936838.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12361a1738---19950810764.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f0830cfe0---31111061824.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070317443773499.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/nojipebixegufenifoka.pdfIn PDF document text
    • http://ashioke.com/images/library/File/14544029306.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/zufosiwasisawibu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b995a7ebbf---93090441729.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/c4660m5p8j8f588imro0mdm1sj/2406867287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nephrotic+syndrome+vs+nephritic+syndromePDF 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_off0000bbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB3 16784 bytes
SHA-256: dcb937a0055f74629ccd12fb6acddfbbb4811f25b255fdf75724ec9e9e76e7be
font_01_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 10728 bytes
SHA-256: 318d181e5f8dd5926ff91a1e13f536e0d03bb930aca2adf668049458a6acc4dd
font_02_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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