Malicious PDF — malware analysis report

Static analysis result for SHA-256 6595c335ed9e216e…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 01:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8cb2f7d355df8f497dc2a27e46f41ecd SHA-1: 4bf7cf9a62d1e5dc38c6c59eabf1ea526e124702 SHA-256: 6595c335ed9e216e1b58368dc1550b4daf0b189dac60b9246c2c17664bc84b05
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. This structure is indicative of a link farm designed to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature, suggesting it exploits PDF vulnerabilities to redirect users.

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://alarcon-v.com/editor_upload_image/file/kumap.pdf In PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/v3hr2ej9pv6ej4ae18hq4o13fb/rosijijajexijopunofoduxe.pdfIn PDF document text
    • http://www.asslar.de/downloads/xuwexoviwafufefoworu.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/jegavepiwosaridusa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/42979211049.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/331608a2bd6b8f321d79d7fdedefec0d/wukefolinipasebuxiveru.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae22e7cde0---71565361169.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b130c273794---lerupaxewudokekajowaludo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5fa9642cda189d6744edea4e0ee6de19/sipaseriku.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/75344349691.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd62bfe7786---neximadepesa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721da2dffdb---kexewoporowuledatukuw.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5u1jq9j83ni0eg7r6h01su43v6/20414984485.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/35968294309.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/berojijagibafobuve.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/fovutexazalagabunus.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/80305928725.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/netfgbenatfj613gmrqj3np793/mitafegepis.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wixuk.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vc3uno7g7bbhhgl34ijtqmr2k7/muvajakevazobikabova.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/wowutasazabebatupotuxabem.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6vqq2mk6qo6mk7ebah1amoq7j5/josabiniwibifobuwukonudu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a555fdb2546---miwenafufaxoti.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c9a4101e9c93706e50630d891cf37e67/21486595330.pdfIn PDF document text
    • http://ibb-online.ru/f/file/67392079985.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/82983575647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gre+vocabulary+book+pdf+free+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_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 10892 bytes
SHA-256: ea1bc98012ac4c136176e32271d950253a2e44859c09aa7d2a0e7765f94824d3
font_01_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 17652 bytes
SHA-256: ac9f44deedd8fade904a872b035a4307bd860814caa7ffa1406d09834067d09d
font_02_sfnt_off00014092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1