Malicious PDF — malware analysis report

Static analysis result for SHA-256 089ae7d6c43fa718…

MALICIOUS

PDF

75.8 KB Created: 2021-06-19 15:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3ed2a8352e9053cfa53ed9b68f13bac2 SHA-1: 5d92e124ede0ac6b4f12d0c813eb5a45020eee73 SHA-256: 089ae7d6c43fa7182190ac71a2826302e83d7f09b641cf445e886dee6f321eac
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, but no executable scripts were extracted.

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://chcial.ru/uplcv?utm_term=scientific+name+of+animals+pdf PDF link annotation
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608890fc092da---47480262684.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/92fcsno8npsdj3bi2t01osrhd8/xuperasujikaxisixo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/51685446535.pdfIn PDF document text
    • https://iohrp.org/f_files/files/vusojibofav.pdfIn PDF document text
    • https://x-software.cz/data/file/fetozole.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/marisababisifotifivox.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/19015690517.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/19532851504.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6d43b19e7---jigokuzuwogemowopizuj.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/zegakuwa.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/kovuv.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/mejosetesasasapuko.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/81ce65ed3c090386344e244ffec353a1/34536646647.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/259dc234a7c1eefb6c050dc5d2c2312c/sexugoj.pdfIn PDF document text
    • http://zuche0551.com/upload/file/revul.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd300d90bac---33183202248.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/nivipipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 5308 bytes
SHA-256: 322e1b854f9c31ef4884f55c083b5228c6fac2c256c672cf254f9fcfec724cea
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10932 bytes
SHA-256: 739d162c9cc4ae6fc106bf403fed9b7e6d82cfe0bfffb1a908ec688a02ba0673

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