Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f108fcf512c887…

MALICIOUS

PDF

67.9 KB Created: 2021-09-21 16:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdf9162907bf982d6a15c8d89d6da01e SHA-1: c46448b27b0deb26d9f0c16fb4eb0a8a61456876 SHA-256: 23f108fcf512c88722f4c2f78553aaa4556a87f2e6ccdeb16513e8d51bbd79c8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://ohadalegistrocbarter.com/ckeditor/uploads/files/xebufenumalefozonurulak.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d87380f9d01b7e63da12fb5e962fed86/fugagopew.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/senokefigisivilazite.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133df6019092---89176070900.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/vawamofotojevavavobatifep.pdfIn PDF document text
    • http://inica.org/files/file///wozupelusatemosigiso.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/tupidanaragiga.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ripesaporelegup.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c61fbb9b8ba3976c17fd2988e5aa9c7f/1869533326.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6278eea7dc15ab7f89db4b633cd504d5/91805883604.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/zugazesox.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/voxajixozujudi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0756f27b---moxesemibevafo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141145738764---boxepemugosatuju.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/pevijozelife.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/vopubuzutobivewuxejuni.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/39998534663.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/ditakonilojejisenir.pdfIn PDF document text
    • http://sakra.sk/storage/file/95931390313.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/kesubafujulajewafane.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/92986160090.pdfIn PDF document text
    • http://szpk.hu/_user/file/48304774791.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/wofokezuxibus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gamecube+emulator+apk+androidPDF 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10880 bytes
SHA-256: 1a3e1c8da7d18d568503306a573c057668d541974729445fe237926cb2e7981e

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