Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5e5131738ea807…

MALICIOUS

PDF

89.1 KB Created: 2021-09-14 21:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5a902c03ca2eb06766d54df0b412369 SHA-1: 59334da4a1b92ffd3fb135e697d84aae64ddf974 SHA-256: 2a5e5131738ea807ae3bc730ff832bece10a127d37673063617dcf3d856f284f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a link farm pointing to multiple compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cafesca.mx/ckfinder/userfiles/files/10239549762.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a790354244---43258911107.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/degubuwuvolufefoxivuwokup.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ce7c774540384b7f6924f0c15f8e87e7/24285686392.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/rejemuwovunuradufupu.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/22853924046.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/14029629433.pdfIn PDF document text
    • https://cooperspick.com/files/rikerugobipumewekagerebi.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/98627908659.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/totazigafaxuzidet.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/56599436651.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/zozovadosebisuduneben.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/15798369822.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/12969349641.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/muvuzinagikifebura.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210914145203.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dcdpdbatlre3l2lucs70bm2fff/68935459915.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/73487678174.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/didefalagedejezal.pdfIn PDF document text
    • https://majubesar.org/contents/files/wofodenigawotuxopajot.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/pemek.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/98045802712.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/rawijugoxisaxovobenonege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=aso+keyword+research+toolPDF 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_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 17472 bytes
SHA-256: 75e796ea86a8953c697ed3fa406209cbd48e56812f8ca6438b26f62ff04a52a9
font_02_sfnt_off00013deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEB 10544 bytes
SHA-256: 05116815a2832d0a46c73cc0a0a2664f9db82e5bb0aa6ad1d59201b72f845dba

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