Malicious PDF — malware analysis report

Static analysis result for SHA-256 247eb4275ab001cc…

MALICIOUS

PDF

87.5 KB Created: 2021-08-31 15:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ef4ea3267ddef94af54260cfd4ddbc1 SHA-1: b3c8f5354af12521851147b2cf5ce1066258d72a SHA-256: 247eb4275ab001cca8b94ea75224888c6dc46e08fed562ed52cec45ac575aec0
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing or malware distribution lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick users into installing software by masquerading as a necessary update or extension. Multiple URLs point to compromised WordPress sites and link farms, suggesting a coordinated effort to host and distribute malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest it's designed to lead the user to download and execute a malicious payload, potentially via a browser exploit or a disguised executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://krisoc.ru/uplcv?utm_term=uc+mini+apk+download+for+pc PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce8192b6c2---46771218683.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/69443089381.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec299f4b9---vujolodapirawed.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7d9c674578bcd44ade0ea30c0c0c3c9a/55671280171.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916e03b8ce7---63321943993.pdfIn PDF document text
    • http://alkanboya.com/files/file///sabizapor.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fabff0dede---91698711930.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/78560883816.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612775ca335b2---65869921539.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce816015d58---kipevalepunugoma.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/3394089287.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/01c6727aa48dbd563c4b30cecb036eb6/16129788395.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/43521631519.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4c857be31---gavorit.pdfIn PDF document text
    • https://people11people.com/uploads/File/2859275595.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d8a5d60cf350f381f4789e7cd729e091/fobanojodijimewam.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/forotes.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/xezofiwufojiri.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/34181840998.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7c86d4155---29075507834.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/guboganimavebotogexuzimib.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124a32be8f2a---69888155440.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a932939d49---50326557369.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_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 19024 bytes
SHA-256: 5a5ee1126726459acd8f7a0b72411759ae26d415431b8e259194cf1fad65b9cd
font_02_sfnt_off00013786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13786 10568 bytes
SHA-256: 7f7da33ff178ed8c0cde0db216987fb7d910b65a784c74e37061dbd83a088bd9

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