Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6681cdca4cbccb2…

MALICIOUS

PDF

83.3 KB Created: 2021-08-20 04:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: bbcf9517154402f4e70c6e134c13d6f1 SHA-1: 22fd02c56ae9ce3ce0f65a34821f786fa9da7952 SHA-256: d6681cdca4cbccb280d209e884a46a790c6a3c2f79b02c26c5953821da370fe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://biogenetixpharma.com/ci/userfiles/files/xebikenemed.pdf In PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/bijawuwodizodavawedan.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c195c3d4734---gegozebujifilolabupid.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/afce92756e11b4dbb6ebb79a3aed0d14/747867837.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4cc2d3a3---58023428141.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/44021904557.pdfIn PDF document text
    • http://thepducphat.com/upload/files/koxarepigobolugu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0ddf0655eda6f216306861550bc5d73a/nojafagakele.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/69191226429.pdfIn PDF document text
    • http://0930actress.com/files/files/53333333721.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vamom.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/36334876779.pdfIn PDF document text
    • https://ewt.cz/res/file/62927810570.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/fekasijizubof.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab27d3292---wamejobekegazizub.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/zunal.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36f56af1a8---77937661110.pdfIn PDF document text
    • http://araonline.hu/uploads/file/40740430301.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/gikesap.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/97441051022.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210720_163057.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8799d334b---gagubovemujewilidofefuro.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/74189263204.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210622011907.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/74590473372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=norma+mexicana+nmx-f-605-normex-2018+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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 11388 bytes
SHA-256: e1b1f6bfadc7ca28b5ce69677b89fae34293e504908da62fa44cc0fc62c4e3d3
font_01_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 18668 bytes
SHA-256: 9a114479615fc5153cc4021cb430728dc5cd55a346768ecbadd7260840da9f57
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1