Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c0fae40e6022be…

MALICIOUS

PDF

80.6 KB Created: 2021-06-13 06:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2b4bc4f2ce667df80b14e1826256b662 SHA-1: 05ae79666ea204a25c25b42310c3aaf81d1a8c0d SHA-256: d4c0fae40e6022be6e922748f3bc517389315140e3feebf7d35f6895bb5e2071
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=gta+5+apk+free+download+for+android PDF link annotation
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9c7637dc591fe6c6faf210bdd425c01f/67627596958.pdfIn PDF document text
    • http://aplus.to/userfiles/file/jirope.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/fosufiw.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gut39adb8hfj2htp52bgfo8ash/20695645933.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb2ac6e77---88498839668.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/460433aaf35dde10404ac5f8c238b705/gosed.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3b5551af79aa825c664e5e0ee0dc7543/30015484431.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/77a27f7dd423db3315aa8ccc7c576877/74735730553.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rl3o1e4b3rholdn6em995satt4/30153893687.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1ce9b9977f4fbc6fdb8678525fc19970/gudajuduwo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975b20d8d3f---84857342747.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e08c97fc8---4878157868.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/r1cjvt4i4oeoggaotlfcu65qv6/11560597213.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/79460527611.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/dinebesagelenolagatuz.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b171dd14c11---49803304351.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/31615280931.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f2b558c03649c5cef1b67a665aa3ff00/vileliridulepawuzusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 4956 bytes
SHA-256: 7c913ba71d56e69a7ea2b4b9cdf8a31fc8b17bb16f797d8222c9d96153779006
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 11112 bytes
SHA-256: 575854523aab664b35bfc35a5f6ec71bacf9a94a24476c48f60a2e9d29105e34
font_02_sfnt_off000126db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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