Malicious PDF — malware analysis report

Static analysis result for SHA-256 210ebf0fd5bc0403…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 16:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f018f6244978da02ea83dfdf53b7e3ba SHA-1: c81d8215279b6ab1bd6880f0bfa878584b36e5e4 SHA-256: 210ebf0fd5bc0403220684443d3b3573b316161077148af4190cfda53ebead44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hoadon-dientu.net/images/files/mazepawuda.pdf In PDF document text
    • http://haai.org/upload/file/92138248297.pdfIn PDF document text
    • https://novsport.com/content/File/xapoko.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/80833320509.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///mujubebedita.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7f7bbd4baebaaf735722bcf4b5841883/xogudefanut.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/sowumakut.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e90094a79---sasolenesodugawevi.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/82589242198.pdfIn PDF document text
    • https://koratspring.com/upload/file/33555171377.pdfIn PDF document text
    • http://ozari-ua.com/files/file/23807515491.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/zupurudufavananobubar.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a3ee3856---92194228010.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nakefaxogarimavexakosetag.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/29964435785.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/68942727773.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/mgbngeeohvh95dst9d7o4f0lum/38008823337.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///99120819514.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/83248260218.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/eo2pp4qdmu41evf0vcsa4ctns4/56137373731.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/28124385797.pdfIn PDF document text
    • https://proxus.nl/file/6469517938.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/difam.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16097d2d62767e---farexosapi.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/kikesulikoxope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=declarative+programming+paradigm+pdfPDF 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_off0000d4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 10864 bytes
SHA-256: 8131e52e52ac27ea315cb0a8b283527882af3ad60cb110c4331aaa516286c713
font_02_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 19144 bytes
SHA-256: edcdef9bc3e5b581938e5d08b8c92cb17d8ba1f6931bbecfce51bdc2e7d815cd

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