Malicious PDF — malware analysis report

Static analysis result for SHA-256 da33c9520138d613…

MALICIOUS

PDF

62.3 KB Created: 2021-10-13 15:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eecd3964e800f2956882a066e8a2b152 SHA-1: 5cc63b8e460e364fb1c3c890a386d1162d3d71ba SHA-256: da33c9520138d613c572e7a4ff676da418306c76598d78f95fd74bef48946ceb
124 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, some of which are hosted on compromised CMS uploads. The ClamAV detection 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of numerous external URIs and the 'link farm' heuristic indicate a pattern of directing users away from the document to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4242

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6246ac2d01b472920ccea1a0a143c78a/35099608641.pdf In PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/rudemakomovizenawoza.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/baporibinenosuni.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/81255079509.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wivaxopadubidut.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/202110127163140.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9d80329033446315f6856afc2580f16c/kakusitez.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16166754822f9c---73493324678.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614c44fc95f01---19608197308.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/duzarapefobojil.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/voduzojeb.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/29344128269.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/52157410256.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/36408850515.pdfIn PDF document text
    • http://haphadoor.com/upload/files/77345175448.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xugon.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/37687500742.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210923184506.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/41488830657.pdfIn PDF document text
    • https://harom.ro/files/file/59700055241.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sojasatetuvuteriwapobolos.pdfIn PDF document text
    • http://taociren.com/upload/file/2109011757214495028gcwg04mhz9a.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/begaronukixodebemamet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=michael+cera+and+pauly+dPDF 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_off0000b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 10432 bytes
SHA-256: cfb4bdea098c2655efef37fb42d214c54986593a0d4b3c3551c58b883c56f7e1
font_01_sfnt_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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