Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e524c24edf2764…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 21:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2ebc44bfe8bda48f85d0ffd28f38643 SHA-1: d99d7ca9bb69e23dcce95a7b9e7151147c07d2e8 SHA-256: b5e524c24edf2764b09a93ee23c74123f2a8f32ca28f161eb2cca1c7f87eed7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The 'utm_term' parameter in one URL indicates a lure, likely to trick users into believing they are accessing legitimate content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=the+alchemist+book+pdf+in+tamil PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe90a1ef6---80061863520.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/baxuviniwedimode.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/rivarita.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/nulavuwolofuxaji.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/87803387594.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/78096372926.pdfIn PDF document text
    • https://inarsindbari.org/uploads/bepikanufuzato.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/mutaluruwepirinemukexisuw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ae5ef86d---nimenijenajibopesubodajid.pdfIn PDF document text
    • http://leeandrewdavison.com/download/69558845679.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/fewifukawenipebekubino.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/85214531203.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/29324327465.pdfIn PDF document text
    • https://filetorme.com/upload/files/zupaluzutori.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/65451461286.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kedonazuletirosafo.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210909082707.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/86379344478.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/50542695792.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b55d0ad62e092b7ec5b548e3e950d650/mujimuwarasib.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/pusimugikufedajibimuto.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/90163513406.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/91821297410.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/samaduxuwupur.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_off0000bbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD9 16840 bytes
SHA-256: 3c30c3e6c661b306f57f7c96a54d3932284fbb4dc0782be627c6c366300c6231
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 10980 bytes
SHA-256: f6f76d9c19d78e2d575a00400a890f6aeae695c2c05697b2b28ec8408949e4ed

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