Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9f0b9c31bbfc09…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 03:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9c217bb876cd0c8d9f6b111a0353bb1 SHA-1: 98a669d9386cea1f9b1ca6c0092ab2fc9bcf145d SHA-256: 8d9f0b9c31bbfc091d2975ad655da161650b1edb325a955242c8143001990430
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or lead users to malicious 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 http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3404laukvgpivud5kq6hcbocd1/36412129880.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/47944796153.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160895cd33ab78---75350046006.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd0e82630f---korenijegipiwibedeliko.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8ede43e74c631e505067b8f9e7f2b54f/razaborinomepa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6o015b51r269j2gp61leadjvej/45505532275.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/tt41v7s5jbtp2516ksuuo7552j/40798405523.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/93191898199.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vomekawopuxatilupuvovupis.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/95050563720.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/suxulebatukavakum.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/60278521098.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zarosisivubuzafeximif.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943dd37236---zeximutipuxizomeza.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8037d94ec823589bf86b85355d99e3d0/fedovibubagovivivemor.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/nawidipimopoda.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba41266c5---23312352794.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/mosisus.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/51934681508.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/30664851428.pdfIn PDF document text
    • http://glassick.com/userfiles/file/20690703727.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f6c1d371f58c2bfcce1043c171783f83/donuzajuzoxep.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b971499f6---95476544448.pdfIn PDF document text
    • http://bienbao.net/uploads/files/63507360337.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/digoposokedilopix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=antes+de+que+sea+tarde+ensayo+pdfPDF 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_off0000bd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 17272 bytes
SHA-256: 802b660e9f38c882b1401f318d91824dc7edb80ed7bca8c9fbe4a97e2ff9e9df
font_02_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 10696 bytes
SHA-256: 027529f2c098f564badbc95b7165491ecae22c24fb459c0240fa48e2ddf5b158

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