Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7f09c2625cfea4…

MALICIOUS

PDF

87.6 KB Created: 2021-07-13 23:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 445b36605a6ff266f5f2466fc597013e SHA-1: 538855f8382298b2a2dbbd45b75cea5604dad308 SHA-256: 8d7f09c2625cfea4301abe58269aa71d1d476e718af514c148c931fa5e4f2fd0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be redirecting users to potentially harmful external websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=how+to+make+end+crystal+minecraft PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/94d8be041fe4053d56d4e14acde8c078/buditipoxere.pdfIn PDF document text
    • http://licausi.it/userfiles/files/vazimesobedabulaz.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b59616c012655fc9d5f59e7c6bce91bd/15478881917.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/safudoweje.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfc88c102---jajubojubasiton.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f99ba6c6557af6b55d2c604ab41a9e7/71127516960.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/97423541515.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nfpp4cejl92f04mtv4jqjint86/berakerolexivitozopuvutul.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bebfdea544a---tetikoden.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/975e75d3e5f0ac8bd7e9567d8fc5f53f/26597231469.pdfIn PDF document text
    • https://argumentua.com/i/file/98055075068.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1ed1769e---zajomodinadi.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/kffidtjatm0lrp7ul42cnvghtl/76600726738.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/79496049884.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8bc00eee---gulutifobofonusawig.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/q447897l7v5m3ckvmbd3ti75he/javegemitun.pdfIn PDF document text
    • https://airshow-bg.com/file/81638320659.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gh8qes92l8l7bn5k75akv0b2pg/27099605254.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/wobifokiniv.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/xulefaditaxu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c57ecdfe---96151135163.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jenafog.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/15744741990.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/rixedoposota.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6207a146---70048377502.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/019f36546257fe77e6213b2c4f4dc488/bupaguwofenozunibitadotu.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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 10920 bytes
SHA-256: 2f98c20624329ea44dcb3f7296f52a88736bab502d85ac625f8d63ea93952ffa
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 17752 bytes
SHA-256: 15a5101388de240c761746d4208bf33310b6efcf707c8d065a1c96debd1da84e

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