Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5891dfda542e010…

MALICIOUS

PDF

77.6 KB Created: 2021-06-26 21:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d7577e363e527790e508975ca75365b SHA-1: eda67e4baa0046afad2c4b3cf1518668db5e8e9f SHA-256: a5891dfda542e01060536dd9606cb3240a56a3210bfe6c75968e956663eceffa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160895128586a8---tabajavaro.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bc64b7d93e8c317765be89e669a1eec5/wezivokoras.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/wasarirudizuriluwivemako.pdf
    • http://transsnabstroy.com/userfiles/file/gagidezuwapam.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/dcedjl98jgt66hu93embt55n0f/63601658217.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/60cdf2aa8a62c6e08cc0bc433a3978e9/salogadeko.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ce9915180d8cb8291f84b3a92e164d40/54422817683.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609167a04404f---69793722263.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb1e3e1dc---tovotewe.pdf
    • https://aashianarealty.com/file/54418135062.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mn89pj61qtdgkk1peaibfvkp73/97528191459.pdf
    • http://beautifulmoda.com/userfiles/files/20791032040.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/65752f1d2969912ee1419d046d8a20fe/60344895128.pdf
    • https://wrd13.com/force/file/zudetemugulukudapadukasez.pdf
    • https://hizlipin.com/calisma2/files/uploads/zesumiwesebixo.pdf
    • http://artecgroupservices.com/imagenes/file/tamiropanoragexezajusuv.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/becc6854d6589c23f51a46db58d1ea4d/ranubaxiterewuxek.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/7a5e9ca8f058b15be1dba66c80159c48/27050868127.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/wisubaveru.pdf
    • http://mofrantech.com/userfiles/file/duzidutarilomixenanupelo.pdf
    • https://arvikabc.com/images/uploadedimages/file/82854209875.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f5dbe95d1861fa9093c6d2f9b8a90131/tawasaxedilonelo.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/futiserozuvolufufefad.pdf
    • http://nextgt.eu/uploads/file/17566938604.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2ca0f8d1---79423348288.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=new+hellcat+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb61.bin
ed4a3dc3e880fa424c1b5ead083cf86ef96e4abc4db2ec8208cd3a977e90a97c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 17400 bytes
font_01_sfnt_off0000f861.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 16792 bytes
font_02_sfnt_off00011078.bin
b0cb2580ad68537b53fc2bb98b4e7e2438b74f33eb42090bd87f3e2ddb913e7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 10300 bytes