Malicious PDF — malware analysis report

Static analysis result for SHA-256 330febacbbf46e59…

MALICIOUS

PDF

74.7 KB Created: 2021-07-13 18:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 008dc32b80547a9085eebdd6dded3d88 SHA-1: 601db741b0a7d82867bad0c09ade357d7f79b033 SHA-256: 330febacbbf46e590c661fdba566df754addb4013c3bdb178e6c76c3384a5d68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft or Super Forms plugins for file uploads. These URLs appear to be part of a link farm designed to direct users to external content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083476d8bfe8---1157334829.pdf
    • http://e-hematologica.pl/users//file/nitubowuj.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7cbce5ca33662b042d110c7a82011dec/50244544415.pdf
    • https://victorybear-info.com/userfiles/files/43127918694.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d8c768a1950fd1de4d5a47743ed53e3a/zafirifuzeduliji.pdf
    • http://alliance-ltd.com/userfiles/zebasibifozoxusilijuf.pdf
    • http://autoscuolauniversale.it/userfiles/files/simisuluvevufutewinariv.pdf
    • https://mudraconsultancy.com/uploads/files/guresipo.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53fe3ac02---31024307129.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/tumjcku8cqc7pk95t7skotprgl/jasimusopata.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/177dd9c5or6svogcghfh901pb9/gobafafogusemomotisozo.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d781d8e60---83177202016.pdf
    • https://mclandpin.com/calisma2/files/uploads/zupizenevetofesojo.pdf
    • http://thevenetianmask.com/clients/71561/File/18426910322.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/xobefujagix.pdf
    • https://latework.cz/soubory/87654219147.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9c899aa0---nunivanajid.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d905e7c6b---vezesaxowukodebilob.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/db9f1e25c14a20e9fbdc0347c1199d27/kivuxugowibovoradi.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607079399ec0f---fokozonetilizeris.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4bkp6e1b9slne0inkqadik6fu5/bovediwu.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47197a681---xalebulatisag.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61015554a---50790948398.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=square+meter+to+feet+conversion+chart
    • 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_off0000c29a.bin
8ab8698b1e0ae21465d36d51774a4a3c7ee3dff968de50cce4157d36157c31f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC29A 10944 bytes
font_01_sfnt_off0000dbd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 16792 bytes
font_02_sfnt_off0000f3ea.bin
b24c8a0b8c665ce74cd6f773e6ee904b8b501b3aab88f5ed66631857862dc6b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 16096 bytes