Malicious PDF — malware analysis report

Static analysis result for SHA-256 083cbee12d8bebde…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 16:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f5e6b50117f9995a9602cd653db2401 SHA-1: 3d08b28782a73063810f42fad09e5ed695f140bc SHA-256: 083cbee12d8bebde437d3177ac32a7a6e01dd9fdded98c32b88f6eeeb650e400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by multiple heuristics and ClamAV, indicating it is a phishing or malware distribution attempt. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with spearphishing attachments used to deliver secondary payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=international+accounting+standards+39+pdf PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612134fb2d003---96264790349.pdfIn PDF document text
    • http://tyextractor.com/d/files/vukowezuxulobesol.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6f6eb982d52b087f5ff2e637d7a4807e/34978328565.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/389a3f7bd16f7465b28279b3430e9d08/nawavizatezibipadejizi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0cdb91f199e5797b77f299be62a8a082/49300690530.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/37611740468.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/82205393333.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/rikugofuj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98893ac669---votujisosekokobisofa.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/d528684a6c37886980d264e14558a7b5/71361455545.pdfIn PDF document text
    • https://manenshop.com/upload/files/22295836589.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0ca76f1fb3c07a2830ed202d11e8639a/948415120.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d56e078dc9b---vibiliviberavidoxoka.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2850e1u6qr534cr9ulv3dsjjh7/jibowokumuridid.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ef8a3931---lazibokan.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/puvumajakipenagedunukeruw.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/xukiwedadatovopitu.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/lenovedosotanuripa.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/35376645448.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8c33b14c5---vuvovuzatafamidixati.pdfIn PDF document text
    • https://viecmarketing24.com/upload/files/baxiripikokefugafizagi.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/13166502521.pdfIn PDF document text
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/putininifuku.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079cac99a509---xemugeviwatebasisavum.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_off0000be63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 16876 bytes
SHA-256: 88af826a3404cc11fd01f641bca302d5c55f611fe115e63a5ed96bf8d9d5ba58
font_02_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 11188 bytes
SHA-256: 5301ca508562a590d2a0f24454c6870ef43a47d3ef370f93947b89816b7e360b

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