Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f156b2416fe3bf…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 23:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47dfbfc7cd96f4ed5e38ec62ff76bbe7 SHA-1: 2995bde3e765b84508fdaa8788535cf62be1edf1 SHA-256: 59f156b2416fe3bf3d45d7729c84b3603d4bcbe0a63e9ac63f8f760f7ea7b112
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and link farm nature of the PDF are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ngoctraithaibinhduong.com/uploads/news_file/figifilob.pdf In PDF document text
    • https://tort-art.ru/userfiles/file/gisopusawiviv.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/90440967825.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b911cf81dd0e685efa5ca9ccc30ead80/logozodetorinelowenanug.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/m9h735hhuakq8usc7668fqg122/17127273180.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/78786425854.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/negenividuxarokoru.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c495d5ad---fazigufojorejedewitulul.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fc0e45eac1700957acc5433dbe208e84/xevebubus.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/g68tju4ek7ajcbgovvutcr859n/gafutaraku.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/29357512560b9f70b4e216.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/32037652009.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/wiroxigajodakak.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/qr89hfd8utl59u0nq0bsr6tndi/nirunezositigonerogut.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/aue5gi9nr2pm6m0osgtrqf7ke5/40172583329.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/jufifoj.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0efa1f56b3d32c47a6b1e857506d40a0/3335852403.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac880151365---45352149376.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/xizidewedejepo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/395c6552d971fc23dd898d1f4eb703e4/15545713176.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f7743e96---mojelogokoni.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d25a228b4d---korabafobazijizisipesoke.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c2be7f79---77369848503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+law+of+octavePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 10084 bytes
SHA-256: f60c9d0aa5a7071fc900a1eeb5e690843a81871f7fba73757fba0b3ebe064716
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 17700 bytes
SHA-256: 1d4ae79c1ec603d434b68d760d0d3707d71d719d1c4904b3b5deea736731e5d6

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