Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf73059a52e12f6…

MALICIOUS

PDF

73.6 KB Created: 2021-09-24 23:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 799d4b2fffe637044c8fc3f106c8a6c9 SHA-1: 6b3b3f16cf3096895da1aa97604b91d93224bd83 SHA-256: faf73059a52e12f6e18b877f63a24f7e4b29be0eda82f8f7d7c902a621d8d1fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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=vlc+for+tv+android PDF link annotation
    • https://solelane.com/ckfinder/userfiles/files/26782756788.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/xazodirijula.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/54644312619.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/49311581589.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/40952010745.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/gupurowiz.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/labugizifuba.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/zavokupami.pdfIn PDF document text
    • http://candientuvibra.com/images/file/jukisewumefasibanegi.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/39240230663.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/gemikad.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/50658003641.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614627ae8c510---gixugifoxapokofifesurejom.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324f38a40aa---segom.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/95451444004.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/fagagukuk.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/38153738818.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/berozexinenaxurugi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404b97c2d96---gafozasuwugujegi.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/85036745471.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/60587773072.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/69989206167.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/83735361843.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/82572506393.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_off0000b848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB848 19216 bytes
SHA-256: 202b0ed0e0b76a6b0e064e85a97d44a3f933101e2347458ec2007ed69ed658d4
font_01_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 10204 bytes
SHA-256: 7a9e1460a6e9c4f7cf157319848330549fadadae361c8e312905a9db9beb510f
font_02_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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