Malicious PDF — malware analysis report

Static analysis result for SHA-256 8601423bcf2f8cf0…

MALICIOUS

PDF

67.4 KB Created: 2021-10-07 12:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5cc9f68623b74a7114c030a8b3d69f22 SHA-1: ed57f91635a30a7f259477a2df2fd5c0c0f9617e SHA-256: 8601423bcf2f8cf09cbcc34592e5f315a7580c10af5011e3abb1677ed8838a05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm designed to direct users to various websites, many of which are hosted on compromised WordPress installations or other potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on compromised or suspicious hosts supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8210

Heuristics 5

  • 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
  • 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://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614f71a2a4855---97670474178.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/h7gjhsf288kvo3u75e03tov7lf/16191307377.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/44543836894.pdfIn PDF document text
    • http://sireny.net/share/files/21729037180.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2052ab4a8ee83a9fe34c27d5b01eda40/98560186330.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/66757860114.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442e3d717de---dotefedufufoforiwekidub.pdfIn PDF document text
    • http://strandedtattoo.info/file/vogijol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484441d8988.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/jibarobabutope.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/tororutaviboxituzarowuzek.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/13330628980.pdfIn PDF document text
    • https://aksusu.com/upload/files/44309138230.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/wazemosozifewaxobatokijo.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/98666725289.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/56329765722.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/piwupip.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/zojimijonelojo.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/47511856909.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/99630372530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=income+tax+return+computation+format+in+excelPDF 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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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