Malicious PDF — malware analysis report

Static analysis result for SHA-256 6471c4e0fa7f8990…

MALICIOUS

PDF

67.8 KB Created: 2021-09-16 13:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12ffb0749badcea75717dfa8e18163bc SHA-1: 6242d2d32395238cbab29d9a1c7f8939252ec760 SHA-256: 6471c4e0fa7f8990877139cdb811a20f88df51d56ce7e64e24bbf703f3e41f98
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

Heuristics 6

  • 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
  • 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://crysiq.ru/uplcv?utm_term=chal+chal+mera+putra+film
    • http://kfnmdg.com/upfolder/e/files/20210914190133.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/32b3c12e049e5b2666f32a78f0fbdfa0/mavokowufe.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/dujibekujekufo.pdf
    • http://wxeina.com/userfiles/files/jetapuxawerusaravupaja.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cffa8cde39---19727241558.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f91bfcc8cc---zafili.pdf
    • https://tvsporedi.si/vsebina/gakitubigizifes.pdf
    • http://mrpennarak.com/user_file/file/jodovozogojoworomedafovu.pdf
    • http://centronegozi.com/public/jadogopenabudowewibud.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd611e0b6---27477077701.pdf
    • http://teedinmaesai.com/user_img/file/24497602292.pdf
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/32717203119.pdf
    • https://searchlink.org/userfiles/file/51415716861.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/bubilulalimotitavobevifo.pdf
    • https://jerseyshorepirates.com/userfiles/files/sokitigolalodedonuf.pdf
    • http://e-instar.com/userfiles/file/31657547603.pdf
    • http://chukgoobok.com/files/fckeditor/file/luzonalajapo.pdf
    • https://mamalight.net/business_school/uploads/file/madamoditewinopebi.pdf
    • https://interference.ajoda.eu/userfiles/files/wemomidulufefolidipuluvuk.pdf
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/foginusuvomi.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161404fcb7b1c2---tupubawurilamekixexajalu.pdf
    • http://neuroxl.com/images/file/19602002762.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/37c981040c95f7ac428bfb312a590df6/deworikaviwarij.pdf
    • https://www.alitec.es/js/ckfinder/userfiles/files/kedipomaf.pdf
    • http://banphimchuot.com/userfiles/file/34896766693.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 16792 bytes
font_01_sfnt_off0000d4fb.bin
1706d1767f5d12f28e86be37f9586f509e84772bf6324c456bb746d083ec3124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 17156 bytes

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