Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6511f8f0c00e7f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 09:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20f3f3beabda1384f20f5e96246163d8 SHA-1: 5954361d7568fde95b01d2cc7293adf2161ace62 SHA-256: ec6511f8f0c00e7ff3d4e3f301d393dd6805e5e7c894eb91566836b9a2e27b2a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://soudurelausiere.ca/upload/editor/file/sodag.pdf In PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/fezivirokenejot.pdfIn PDF document text
    • http://888chji.com/userfiles/files/56266193744.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16104470de1b38---11386362579.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/60260411213.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/batoperapatizalatuzaxij.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/01187dbc369a97957f78da48cd749901/wumujepetuwitalelijabuf.pdfIn PDF document text
    • http://bamila.vn/luutru/files/jodetos.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/4362530308.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/23341972323.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/42665724911.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/wofovurogodevez.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ff0ac99713ca48ca90c8f6d422b2c81c/katuzafeg.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/35a30ed5a1d6d85d4966afaabd8d7bc9/94546225041.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fc65b483---tumibikonunaled.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/wefida.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853e29850ff---86273554654.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/92000863486.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/dunotenapefajerevof.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/6702507730.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/67nmn3fh1cth867fc0n9df5bu6/84080072708.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdae460db95---lemezigurigujanezabudeda.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/nd4nj72vf2am3547dvs32i5ohs/toralusoxuzujapi.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/42651975128.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/dukonatedexodarugux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=would+allow+synonymPDF 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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 18560 bytes
SHA-256: 769bef67982c7bd9a2120b258158f338e0d554ed00fdb572a416e7be355c00b3
font_01_sfnt_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 10280 bytes
SHA-256: 52530aca73b30a60f8b094bf509fb1314e2a3b8e334ec6c420d7ee9162a9437c
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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