Malicious PDF — malware analysis report

Static analysis result for SHA-256 e750ef869e957262…

MALICIOUS

PDF

85.7 KB Created: 2021-07-31 05:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24ff3c700a32bcbcb42cecedac0daf1f SHA-1: 32f82fe499773f531d4b0839c678e580242f63fd SHA-256: e750ef869e9572620f3f9ac7b65118e84c5ba003d354d5bb46f7be71a7e4e1db
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a fake browser extension or update. The embedded URLs and link farm heuristics suggest the document is designed to redirect users to potentially malicious sites, possibly to download further payloads or steal credentials. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=flv+video+downloader+google+chrome+extension PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7589da1806---jujisaxozidorokepebopib.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/76272776196.pdfIn PDF document text
    • http://dges.in/userfiles/file/20473964108.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c7fa6857f---2862985946.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1076dfaa66c014dca23456e64f136e8e/31742290377.pdfIn PDF document text
    • https://zhansq.cn/upload/file/31781596915.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/77192344235.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/zudibiwabesolaxabisijo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/tusamimo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de44e535612---xenogedijataluvud.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3301aa31d---gasip.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/15863684826.pdfIn PDF document text
    • http://minhanh.com/files/83211366178.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf87ad1639---3311748246.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbb5cef234---mataxezijove.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/53369178177.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/lovoriro.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/fetexezuselivifumarinis.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/bcb2664539d0cfce7d73ef50760e4226/59903167818.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hbf60crgrth5oagv4vtnfoag8p/timavikomarumuvisagap.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/46916773197000db16f1f8a02bdf28d5/82360471097.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5ee1eb9cd514abbeb9ccb6af811c4e7a/45170334076.pdfIn PDF document text
    • http://esistore.be/userfiles/file/99230096342.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/15860403348.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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 11048 bytes
SHA-256: 72738f9855c9edbd65a163cb03033dcb83e29f0dfd4ff1caa385420280f41db9
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 19480 bytes
SHA-256: 6ca34574edbbbb6756165d52e72e462437c785737385e19d1ce38a0ff8f0b8ae
font_02_sfnt_off00013035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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