Malicious PDF — malware analysis report

Static analysis result for SHA-256 6085b032dedbd4da…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 02:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bbdd8b75776403ff6789766c0735d6a5 SHA-1: 1df10e67f80c4c9aef4bb369c6c1de36181b3c69 SHA-256: 6085b032dedbd4daff70a9c3f6ff6943a4f5b239b63cb285d02394ea3c0d6c09
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 0.9994

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 http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105dfbdd0ec1---94505041747.pdf In PDF document text
    • http://lltsg.com/uploadfile/file///2021073109102748.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a36f14dea---41859165407.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/cf4159f3e54631c66f38b376f25a2e8c/65773895623.pdfIn PDF document text
    • https://chptravel.ir/data/file/sapimalakewepusekufodoro.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608821dc357fe---lovutazupemebomuzowi.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/38565700532.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ad2e7668bb74decc37e90167305328ce/6687756577.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/gh22i3nemhrlgppp3a7f9bted0/84722709142.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/muzekedaxugipeval.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/gerobuzilejumonesobez.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/gajarugarutiwodiwurafox.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcaf9b477---kuwubovopopelejuvowele.pdfIn PDF document text
    • https://limsurempat.com/contents/files/tegobovele.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/61899328776.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/13152996880.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e4a65cb8---norisufitixogebemuk.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/bevatipos.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/gidosezetazikexaxadedama.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/49001310477.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/aa0d5b60d4d9fb091de4fee7dc68e392/19431319935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rca+10+windows+tablet+32gb+with+keyboard+casePDF 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_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 11592 bytes
SHA-256: c838fc39624f5d10266b293da72b916a494138210d8ddb3b202e212333b12892
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 17076 bytes
SHA-256: baaa826ab45159b47e74bbf79910cd2b5511fcf7c53451c6cb2c8cb7ab9c8e69
font_02_sfnt_off0001425a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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