Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4efbf4731bc64f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 10:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6708ace50bc830bf535e533c94809c15 SHA-1: ddee9894ebf46b65d95594cf4aed714ef36e8f1d SHA-256: ce4efbf4731bc64fd2d085cc1812f5371f6345973112ff3d9f000b4655832322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=cancer+staging+and+grading+pdf PDF link annotation
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/10938869045.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/43a76071b11cc87d25c6102ee4581538/forogurokaxufapise.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/20080474403.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/wewobel.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/tumevelirara.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/73039183581.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/57413340563.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3190e79a23---52299561651.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799271cd3da---12757046903.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/87191339461.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/9097318836.pdfIn PDF document text
    • https://ahha.az/userfiles/file/vuxapagegubinibivide.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/90832069477.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/simujudepotivalu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b198e712496---zurukifakalivego.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/18964156836.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/dirix.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/4951038741.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/81719256848.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d54021a39070b67863014b80002c3c52/livunadu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a036aca4f82---gojafamudatafija.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/lowenasak.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/sizux.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771e9e01b0c---23280260965.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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 18052 bytes
SHA-256: 798230388975049d139f61362cadfe099b9665a45dcb8bc2a59d9a51ba357c3d
font_01_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 10660 bytes
SHA-256: cb234c8a846a0f289343591a91379ec7b9d0214deb0dd4061fa2778a8233b483
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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