Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9a29786b329eff…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 23:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca035960ebcdc7f7c66e2daaaf77ed5f SHA-1: 85409a49585cbd343f122793039297a5aba879e2 SHA-256: ca9a29786b329effc95e5f43f19d93ec43ee847b6501bfca78b7a6952ff0aa24
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document employs a social-engineering lure, prompting the user to install a browser extension or update, a common method for distributing malware or stealing credentials. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it likely leads to a malicious download or exploit, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=chrome+mobile+cast+to+tv PDF link annotation
    • https://jphotographyllc.com/userfiles/file/47471439123.pdfIn PDF document text
    • https://partetesal.ir/data/file/29803744723.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/vosebanat.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/satasuzunamu.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/75872927804.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/14623907463.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/06922cb6e4c328c1b89c93ad6658bbe6/35320473825.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/10037517133.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/68553713291.pdfIn PDF document text
    • http://gojjang.com/uploads/files/87478403723.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/betimarojiledufifipiv.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/27490005085.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/31352523582.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/255074085.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/jonopiva.pdfIn PDF document text
    • https://megashina24.ru/files/files/xavesimuzusukusibeno.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/1041236889.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/67763836501.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/20465743622.pdfIn PDF document text
    • http://boki.hu/editor_up/15397289444.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c3d057a2abbb87f0bf40b50b8050036/puxavexosikisukeripi.pdfIn PDF document text
    • http://sushibelovo.ru/files/88870128129.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613394144ac99---zowajefifabifumo.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_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 10628 bytes
SHA-256: e5356d009a2cfaba9bdfbbf85493eae76bb94223b8f4269295ff90f37425e837
font_02_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 17972 bytes
SHA-256: fc4b61fcd8e37c0eeeab29d49ed1d2ffc9745de43c1ba7c3b1e9ce94d5dff85a

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