Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc231bd31dbb2774…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 20:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d95a01a62aa9fd3a6fe900f268b162dd SHA-1: e3577245581b1aaacd550bccd8809508f841db7e SHA-256: cc231bd31dbb27746d70d986f3f208f8914a82049fd87a9335ad8799cac87252
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on different hosts, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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 http://feach.ie/images/uploads/file/85260699137.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/57831539798.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/tufisomakitusajuvad.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210916_40AFDF9ED72B44BC.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/liwotuneluforijifibalo.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/bevuwumafefivuxigodononi.pdfIn PDF document text
    • http://camonetinternational.com/files/file/43888475824.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210907_215125.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17f067d6c---57796767002.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/24370939155.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/natanudogaradisin.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/gimudulodusu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/zagedivenukewov.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/pulesafo.pdfIn PDF document text
    • http://preiss.at/upload_files/files/99954645723.pdfIn PDF document text
    • https://penzion-palice.cz/content/vupaduwalisotixixaleb.pdfIn PDF document text
    • https://norservis.com/files/files/powuzepuxa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134754612ba9---94938880183.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/44d3dedf8445de2e6f25be318ef2501b/71706093511.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/61937484920.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jopuvexunopinuferu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161435e8a61e51---28954807385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=techbigs+among+us+airshipPDF 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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10880 bytes
SHA-256: fc4c17b1c636650e09e74888671f72670788c55eded61dc7dd8b6e0ae49082d4
font_02_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 18560 bytes
SHA-256: 0a44274497438a0622d2e64be271720c08f0881883267fa1a156a541b0d49efc

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