Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dfc81579f7ef72…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 23:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8265bd22e6b2e4b88d0564681556c4f SHA-1: 693a2c2cbe3a20afae0013d42d130b94c8f31396 SHA-256: 05dfc81579f7ef72c06f68e836e3e87d5ec7150418030dcaf58aca952c9007c0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, suggesting an attempt to trick the user into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=vaal+university+of+technology+prospectus+2018+pdf PDF link annotation
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675cb31ae5---xafefug.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/78907981710.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021061423443573499.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/bilovew.pdfIn PDF document text
    • http://flirdining.com/uploads/files/9600929177.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/61103442155.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b93d76572---73306020357.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/zokadilezixarutezanef.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/41603029486.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/36791568537.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3c209d7ba127f0d3d78a30784b85818b/72921835716.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/97909431099.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vomexitetunolewalale.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/63638606363.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/9361407143.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/83309258337.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9b4a2000b9b1f7f4f1ddd47ee9ed5a33/bumativotik.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612c4d61941b8---69880718802.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/003j9rpfdj597ds96bo88o2jqc/worajorazefibipagopasavo.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210630153716.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/80146619911.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/valobupijejawebavo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 11648 bytes
SHA-256: 375aa86100de6b26871fb68b35eedf59dc1e41be6c9b92331e8c0306467e1526
font_02_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 17456 bytes
SHA-256: 44e72d71a7201de35673849e6a0fb17111e7941cabaaa4c5ea73173e8dcb3889

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