Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59e87e70bac9229…

MALICIOUS

PDF

76.3 KB Created: 2021-06-13 20:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b205fad580ec61f38af8b02a4ad3d4f2 SHA-1: f49b6fdc928ca88daa261254dbf4dc7f6ca35ac6 SHA-256: b59e87e70bac9229b8871345a1415a4ead6e9963e231070421c6ae3e73df7e35
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Vtu mba internship report format', likely to trick users into clicking the embedded links.

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://allytemp.ru/uplcv?utm_term=vtu+mba+internship+report+format PDF link annotation
    • http://dansensvenner.dk/imagesfile/%5C/11897097302.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/s2f2c3moc9dqjo8hmkqruep110/nawive.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/14725231668.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56a848a82---88515803662.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/52961174203.pdfIn PDF document text
    • https://susta.vn/userfiles/file/fudazoxup.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/medunerotupa.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ee57bf56be08401b8104b44225d21846/pegadojineri.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/mironeziwesokit.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/78154911453.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gavekiwuwozepetupo.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/kizirojaluwizu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928bb5ad8ae---34876462069.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6f19f1cb3b171dd2e5dfdbd6676da298/rasovunejorituzakubizufal.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4fc5177d1---21265321085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1812951fd1---laxorisorebatuj.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 5216 bytes
SHA-256: 4011b0154983029bbcbfdc0d56bd6b476a1e0c909b25c986a4e0d32863a58b5a
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 10280 bytes
SHA-256: 6aa1ae1e36b06b2d3dba6e4c1246a5cb29a0707468d83671187e1ebf0fe4f9eb

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