Malicious PDF — malware analysis report

Static analysis result for SHA-256 84007952ea37c8eb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 10:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae09258080114ac8a7c41399020c61c7 SHA-1: 7a22451be280102b7f419a9137e1ebcc4a27a909 SHA-256: 84007952ea37c8eb7720b4c5927e41afb42100176299eeaf889c06f424b59b9b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on potentially compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5903

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 https://tort-art.ru/userfiles/file/93655798684.pdf In PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/baxap.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/6689284985.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/makivorelade.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/80464153051.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136149da7e73---zurunikuwutugojarajado.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zoneleveli.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/jatunivofisexuwen.pdfIn PDF document text
    • https://tigaintan.com/contents/files/39922158203.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/voxugegegetalof.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/66620760371.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/70359226699.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9cd33139---9170505524.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/99928323810.pdfIn PDF document text
    • http://kasargod.net/uploads/file/latizivifat.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/3413632736.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/wivomomemutujuzututaxipef.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/36732349019.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/rasaxav.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/daliwovefalezaja.pdfIn PDF document text
    • http://trivio.it/userfiles/files/62764780322.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9f1f5e527---80275340188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sync+android+contacts+to+ipadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 10520 bytes
SHA-256: 1e44bfbc3e8ea6326be327951a6fe9f79a2e34d8a971e9651faf1d4e8191691e

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