Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9ca614b7f30243…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 10:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c18a22b7711b3cd85818bd91442568e7 SHA-1: 730fea971d6fea48b32a082e1ce55b5c9d03ca42 SHA-256: bf9ca614b7f3024356290ac73337e4cc9a9193a5d49e40fcfe8dddda5b356e7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=mudra+loan+scheme+marathi+pdf PDF link annotation
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/mejikadenegegafigivimuzu.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/12393b21835fa80e322013281adf7b38/73094153129.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/68914613390.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/51266023922.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4e4677c9---dijeboz.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/dukoz.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/37817572550.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/25u5csoaiqdhgb6ni5t2d5vj13/82230983588.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1322109c61f82bfb3b1db3060def844e/57924297215.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/muruvusije.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/karuzadevaroregiru.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b1de830e---sikumul.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1e164b05---14332380330.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3719496b4d6c55f09d59f7fe86e638f8/fazikosusijinepizowalixo.pdfIn PDF document text
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/soduxopiludogelu.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/15031588268.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddb65a1ef---83522677681.pdfIn PDF document text
    • http://imi.vc/upload/files/bubulipuzanepexumoba.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/20218403872.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/75411088336.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f35fed48b---gepidepe.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/6653668776.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_off0000c90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 10976 bytes
SHA-256: 4bb42f6c24a1c58698031f3d913c6c195fb930e907d01b1a671252dc0b85bdb3
font_02_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 19952 bytes
SHA-256: 368c610172cba4f5dadcca794555be22632f9bcb971cb6f5f1f17c3b8da69b9f

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