Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20ddfeb95c730b0…

MALICIOUS

PDF

79.3 KB Created: 2021-06-10 19:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30554d0a49c940811b756daf40ee2eb8 SHA-1: 69cfa1a2c9c81e735de5d3f2ee8fc4ff1b426eef SHA-256: f20ddfeb95c730b0f44bb663c80ca8408c78d7473cecce9198dd1635f35e1fb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=what+is+movement+in+design
    • https://genericdiabeticteststrips.com/userfiles/files/texapitogujefafafuwunumo.pdf
    • https://sunarchegypt.com/userfiles/file/47434807184.pdf
    • http://svsteinfurth.de/radsportfiles/file/jefitixaxid.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba93fa90fca---56036548421.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951334cc999---vakutuvuv.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5fc9b67ab3e6e02471cd76c55453c751/mexej.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3d25b55d8e303d4b60857e98156b75d9/14882807398.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/01d1a9f6c8d2a20dc8ee7948004f9b00/dusaru.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d5f42d272eab40a48481c6b9fe038c9e/31274545683.pdf
    • http://banghaija.com/userfiles/file/16930733089.pdf
    • https://euroroma-bg.org/files/file/begibafovobevuwapu.pdf
    • https://chmelo.hu/sites/default/files/file/bisakowapivedugidemezuz.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8353c5cf3---77515615407.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/it93mkani1gikibdto0s0u3sv3/25255610146.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072483cccb23---zonetoniwodugavagoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f805.bin
725f826f210b70445d5b41da80e507d465815801e0e3b364d1dfa0045c2fb7bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 5184 bytes
font_01_sfnt_off00010996.bin
a25fe9d5c301eb2c681fef62824bc6937a2ce3f7f246285822b84a71679b8067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 11528 bytes

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