Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ad77e21f9b8a63…

MALICIOUS

PDF

97.1 KB Created: 2021-06-26 18:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 367e1572208b9142f57b2ee41a6fe7b7 SHA-1: c3d7c4e6d0e43281594c5a90256ab290c5b75f53 SHA-256: e3ad77e21f9b8a63a64acd826153ea18c47d93da7eb310d17e9cf425c3979c42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the structure of the links suggest an attempt to obscure the true destination or spread malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://leganordavigliana.it/uploads/file/94786197801.pdf
    • https://vettercycles.ch/userfiles/files/4423842416.pdf
    • https://accuratesearch.com/userfiles/file/ledironuwogipulozet.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735fd17eff7---wasesadujugona.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/pefamevaporipafukupanuzu.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d601f8c159d---befojitorazimikif.pdf
    • https://communeouchamps.fr/userfiles/file/79175341943.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/b1lgubqs96l6v7s6khd5mn7ikq/64061838609.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/91llvdl4m2kd5lsstta23h0mc4/duxigufetixesefatanepesu.pdf
    • http://chiari-web.com/ckfinder/optimist/files/maburuv.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/4548434232.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/i9o0npl7rdtbpm49kf4tbacg5b/lolajagesu.pdf
    • https://mamap.in/ci/userfiles/files/17072031261.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/natikuwifajotimitudi.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e7255a656bbdcf8ec2361667a67379d2/vixap.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f39d3a3426---91338006014.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/gagakepigalo.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a999c82433---42597728605.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/08250567a2ae4779ba091c91d3a4bbf8/60934840192.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/917edfb1afa06bf40c4edb60f05969e7/99161209606.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160705b62279ad---bumoxapiwasegujapimuvudap.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/88836771ed06fd8beb2b7d0c7cb75c64/8084568512.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/84ae2afef1941801c90062131d31c9d0/39168138021.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c930b8ed7f6---mozopuwamiwofa.pdf
    • http://jnnycc.org/userfiles/file/60108905261.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c194ca073a2---69982967673.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/17891545852.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=small+business+operations+manual+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118cb.bin
c901b1e5a9e4667bc6fccff8126a70292144f46fbcecb2875a55bd87f073cf24
pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 17152 bytes
font_01_sfnt_off00014576.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14576 16792 bytes
font_02_sfnt_off00015d8d.bin
e4f1d006a92854dc3e79b6e0f3fd088a37125240fc5856bc30d9163e332fc0f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8D 10976 bytes