Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f461dad94dc88f…

MALICIOUS

PDF

89.7 KB Created: 2021-09-16 02:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a3c10beb3cf2594c0690c7de10eeb64 SHA-1: 3e843d62dfc4f92fe1aa5407cbc417b14f18b91d SHA-256: c5f461dad94dc88f3fde3d6c9e9c80536dfbbb3fa6c3c925923b82433d0eae3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=lebanon+in+french+translation PDF link annotation
    • http://ahchala.com/img/file/xasovewurelezuxasodiwomo.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/vegadog.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/59744959060.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ece42239---purasebetitagavujeziza.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/titilanavepoxo.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/rizivuweredegeruv.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/27214648326.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ef583c75---36772150586.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/nefojunetefojo.pdfIn PDF document text
    • http://fittbikese.hu/files/file/80508861286.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lamutinifikede.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/lefuk.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/manudojizivegogezifodifa.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/xejasemofaketav.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c55528c3d---87673510233.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/14832519332.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cc50f2797f24ded98163a0a60237aa5/59906653840.pdfIn PDF document text
    • http://holzweiss.at/nazupagivorem.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613758800cbff---1573166164.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/vonoxujediwekuponulix.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/begoga.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/24822853206.pdfIn PDF document text
    • http://firegallery.ru/img/upload/53649937817.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_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 19440 bytes
SHA-256: c479954bb0d22361773743f78309be2887c61b7a79d90cb599a542e74b3e427a
font_02_sfnt_off000141dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DC 10532 bytes
SHA-256: 5930a279c9dd6d5dced66d69cba508b5ad3824d29070cb0be1de56c8c64f25e6