Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcea288fd411f9b…

MALICIOUS

PDF

91.2 KB Created: 2021-09-08 08:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc87b92c0420bb3b519c488cfa300bf7 SHA-1: f24b875f8aa3b1068e1f0f6755bd7675db48a4bd SHA-256: cbcea288fd411f9bd833129c100e43b451144f0938bc563162c591d47b55e6fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a link farm attack pattern.

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092863dcd44d---dabosereketanub.pdf In PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/1faddad6175c6f40c0c791dd61b77180/15717471972.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210612025625.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/95370172025.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/a9pj3t7djv1c6qpgc204fjrh0i/dotuzi.pdfIn PDF document text
    • https://vitanov.rs/files/78468271229.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b902f90948---22111321725.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d62a3961e---61361884982.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e79e59c1b---77148151956.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/pagaxabevu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9cd64ae94851c14b8d67247772edf952/wigenotogekonexikoteve.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/saworitimevamadegexejamub.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/lalonotixemug.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafe6dcec8---81043289636.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wexelewisunenix.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4sl2u0q5fuaftcl4i7fsq2d8c3/subuvoxunezibexurogejup.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa553ea9756---xidijafolamefojaxadupalu.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/37984451556.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/80101615133.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/ramawupugumerunokuru.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68cd8f2003---23908004891.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/nriu772r6h18qqraubssra8rf1/94424959943.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/45870181078.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/siwaj.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18d288107---44628962504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=agricultural+economics+book+by+subba+reddy+pdf+downloadPDF link annotation
    • 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_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 18552 bytes
SHA-256: 4207955de8af515157b2d8688b81ec25c92b21388d347610b12e9513eee430ff
font_01_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 11476 bytes
SHA-256: a545b0cebd9c20e300e74427675ae517ab359a329e591c7d824293201e01f4cb
font_02_sfnt_off000146ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1