Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25751d3527b11a4…

MALICIOUS

PDF

66.5 KB Created: 2021-10-08 21:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bcb5b56fcf063dc83b5f00c160a8bdea SHA-1: 2b44beb66205a0a31fa60ea667a52cebdd9be027 SHA-256: b25751d3527b11a442a8d3b10a85e70e5f1d4f271f11ef113d944dd24816dc61
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5262

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.
  • 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 http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161456468a9d0d---79600398844.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161462f6f8a0c8---45581551299.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/vibazebepokoraki.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/52778463458.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/44263375041.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/76632612458.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/66828815173.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/xemivovilusububupelun.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/fogabixiwajudopijuxe.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/2780096562.pdfIn PDF document text
    • http://keacg.com/upload/files/10199171957.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/televaloxa.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/tabubaxojatadolu.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/34651636216.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/towenebagexore.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/39974725054.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615a308c51dec---velaramod.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/86406133772.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/dobira.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/57268674905.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/71901710568.pdfIn PDF document text
    • http://poliinc.com/upload/files/45140992215.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614780db1a185---berajalogituli.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/23714627745.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/56610456197.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20211005195952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wephone+mod+apk+unlimited+money+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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