Malicious PDF — malware analysis report

Static analysis result for SHA-256 f541b1e3fca29bff…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 09:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 00d016a28633707a8a07933440e206d2 SHA-1: 39589ba29ffca4de7506f071f5d660bfceac5d86 SHA-256: f541b1e3fca29bff0e7ff4bbcc85a0bbff39165592d90b7622c684b131445df9
196 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. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://prtourusa.com/FileData/ckfinder/files/20210906_2616E8F20A44A134.pdf In PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/63318019332.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/firad.pdfIn PDF document text
    • http://packturf.fr/files/96728290727.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/10519770813.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/41955925711.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/53929379687.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/25005976428.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/19495849096.pdfIn PDF document text
    • http://wwstationery.com/files/file/xibama.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/gobumunoretetamegapiri.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/9914754685.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396cec6aae---nipevoneze.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/np53iaceitpr3k96209pc9gk3p/tolominerurowimilelilegiz.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/zokasodoruwi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zanutepaxub.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/94017078608.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/fodazedizusu.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lejebikejakeg.pdfIn PDF document text
    • http://badgerhillfarm.uk/jaguzobo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed4a516980---sinuzelur.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/48481533585.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210903_2D72A50D11C668D2.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/uccln7cijh7t43f26gcnbh0663/70841066098.pdfIn PDF document text
    • https://computerzone.pk/file/1004216087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=qemu+apk+downloadPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/50314625629.pdfIn 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://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_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 10432 bytes
SHA-256: f55b85c4db562467492f0ce773037562e090c5d65dde2f41f95a0e9d66ff0f4a
font_02_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 18132 bytes
SHA-256: 2334d0574475450cff05389c749372396674171871a648b4ea80cba4548dde1e

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