Malicious PDF — malware analysis report

Static analysis result for SHA-256 100fe65bbb5d51ec…

MALICIOUS

PDF

96.4 KB Created: 2021-06-25 14:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3d418d280f0eb4dfb35023b5ecd1108 SHA-1: c0dd2c05eb54f1cf4dee82ea2ff52de6b1710794 SHA-256: 100fe65bbb5d51ecb8be73d4c8dd6d24ab38a52609b69c370139b31cc6895d68
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://medvor.ru/uplcv?utm_term=ir+stands+for+in+computer
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/93317cc419a07cc0a9cf8fe7f912189b/kejosiwuxuduxovegekosimop.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee6f7b541---33874317456.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd9bd955f---zofupemewusexagirofovodur.pdf
    • http://ecohort.com/userfiles/files/21491550059.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/133911e8f8345089308fd6c8b61c11d2/galuverejet.pdf
    • http://stroisvias.ru/userfiles/file/96136748311.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7409af0fe3d72c01835015157b62c0f5/wozidix.pdf
    • http://hb1004.com/userData/board/file/68452349560.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/n5uiclokpls49sfp9a13onhed6/basedepewinupumu.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a493ab8e---27322723948.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b5704eba---vajexotojena.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7b6b7eda7199b7a877dd1e183cd8cbf4/80269865413.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/2kdmm6efkb39khj8aufls24sgi/xixilokotukomofebaru.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/beaeb7c5a59ea5c9b16d8a34b23dcf6f/fikedupijovidusepilafi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001168f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 16792 bytes
font_01_sfnt_off00012ea6.bin
c9b99356020641f644b3eee94f2d17985b1b823bc83d244f992498a4bc81cd70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 10784 bytes
font_02_sfnt_off00014779.bin
ac899a56df38ee3eaf525c52e86ded801e7414494a363344bcfb6f526c8d9ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14779 17516 bytes

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