Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf480f7ae83a08e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-16 11:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ceb5e64e1dec06fc673c62c5ecb8df01 SHA-1: 8515462790cc75f131876d8f0e80e1484d002b50 SHA-256: 3cf480f7ae83a08e15d78b47da68022ff99617538f25622930b9a12f157de5f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://aduanaldelvalle.mx/userfiles/file/41329183190.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54efef228---54345917128.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/33982672773.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/72120155955.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/9fccdbb7db082f441cfe78f1a3279838/89504579118.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076116b4e28e---tatamurogufotiwi.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/26cab448862d69989655cddca60a0e81/xenazagopaxinak.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/29352800228.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/gasawel.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/jujelijijegepixajuxawaku.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/viwarenimupedog.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/72c9b922b3c1c57ab853653a5180062b/sokafavagapuritifefuxine.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7db8a953---28294120516.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/24032959623.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/nudobifagudinof.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/nivuragiwumeziwop.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac6a4efa5---63278087695.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096430e53c7a---xigurijutowaminitaremepu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073216667789---jixuji.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/49389174295.pdfIn PDF document text
    • http://houselandia.ru/files/17622409146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=season+3+of+atypicalPDF 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_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 17608 bytes
SHA-256: 2fc7758301c50debbaa681e1a3b6a8c8483eefa2d35f3236e089fe1ec7e1b582
font_02_sfnt_off00013987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13987 10736 bytes
SHA-256: e331d286e4f8fc40b79a9617ecd5f11d6940884154fbcf4a42482145512c3b4b

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