Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c55f633a56057d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 21:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e5c2a176c199530632ead6235a2efc0 SHA-1: 2493d7e62928235dec33561cabf9df07f7568c44 SHA-256: b1c55f633a56057d7857bdd46feb2758eb4a7ccc102374b2bfb3d56715cf8f7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6300

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://akiisushi.com/uploads/files/39848729738.pdf In PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/80214076408.pdfIn PDF document text
    • http://beiks.info/public/file/64981868616.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/83411884743.pdfIn PDF document text
    • https://esz.jp/img/editor/files/43768211209.pdfIn PDF document text
    • http://cobmedia.hu/include/nomukikatevamubilorixix.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/33932954563.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qolhe0ct66qpqeftcdvf02l0oo/luwowimariguv.pdfIn PDF document text
    • https://pepsima.biz/files/file/vimubijewafijemekaw.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210912_C03A924813F93A81.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/1572101904.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/zelodulunisisebagu.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/2883743419.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/51415716861.pdfIn PDF document text
    • http://thevalleytrader.com/files/xojozemoma.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040359502762.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/64756264978.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/23964726809.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/603b4a3fe6996f285f16f6f65a885db7/fozadudedokixasejusitim.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb14b4b5be---doverixoxubawenajizaguxu.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/rimopexurudovokipekebijoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rummyculture+app+download+apk+old+versionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 11176 bytes
SHA-256: fc6370c9e6a54733b2b422689e294a4268b11d299a4baaf46e4addbc352e9800
font_01_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 17320 bytes
SHA-256: 3fb870375205f4ff5e7e1e742d879078dd8aac4c4664527c87bc8d49c62ca358
font_02_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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