Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2373e9052c6d369…

MALICIOUS

PDF

73.8 KB Created: 2021-06-16 01:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 009ec4f54b924d5e34a479dffdbb9777 SHA-1: 07c65573f213f507cac03cd13497a1a8d192c80a SHA-256: b2373e9052c6d3692343135100797ba97b02cea0da0bea9e9a84dfb7626da884
156 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious 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://philabc.ru/uplcv?utm_term=docx+to+pdf+merge
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8586c719---levumebawonopotasugavokaf.pdf
    • https://fanaf.comarticle_ressources/file/xagabumewu.pdf
    • https://mimpishio2bet.com/contents//files/janod.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a7ae0eca6306ff80e105b503771ebaf1/40879245253.pdf
    • http://aldara-latinoamerica.com/userfiles/file/65229810244.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vht3frle4d0eshbr0crijae41/42260577871.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9ecea8ef---tifuxixukipupi.pdf
    • http://timeyear-v.com/userfiles/file/42183527183.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5eda8d6272ce2841e9f4a7fd0f40565e/50398785300.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6942d3911d2c39a043ecdfa592bbb46d/97932748901.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f433e52ce8---6611196294.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bee714b05---sovijeli.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/bb975999388d280e5f8f3a55025fff83/4112084846.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099c223e2480---85013484756.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6056550567---22361516199.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d1b9c082---tazumipulok.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_off0000e22f.bin
757bf7e34d54e5b218e04dff089be1affe17e3faff0a2474a2c4c5a13d73095a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 5124 bytes
font_01_sfnt_off0000f399.bin
2e924e912dffb8555e5eac29fc7a8ac991265126c639799c579320277f9cd0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 11372 bytes

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