Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a88c1c82ba1790c…

MALICIOUS

PDF

58.0 KB Created: 2021-05-18 13:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 20a0e7b1792a3c28d45e74aaed7b35b7 SHA-1: fb86076787b3f979b6f4ed93a8d7d45d558e1ea7 SHA-256: 0a88c1c82ba1790ce84181e70bb6bac3b85e2e6847a3570028dc06a989c86d6e
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. While 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 0.9961

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=simple+harmonic+motion+pendulum+lab+conclusion PDF link annotation
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0da06aff3---dowuti.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/48612183790.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896cdf2f54d---tamumumovatifilapevesem.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/pavb2jvlbvpdmlmhm91loth7t3/fuludowuse.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d825b81a8---51972576307.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/zotubopemadirimulesutara.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c62bec01---bejabaw.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae74b3a392---26687534740.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/89a8a77fc19m5psfo2qlr76ha7/64690994412.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4879f8638a01f6d79c62501be328dd65/82910474892.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070cec757ec1---14588674226.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jovepoxevowezu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/3377721723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 5556 bytes
SHA-256: 615755e055bdcd6cbfacbcbef66d4dab93a81139de465358c0b7444ddf57eab8

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