Malicious PDF — malware analysis report

Static analysis result for SHA-256 680ffabf2b09afd6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-14 13:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bfa5a0d4c98b0e19347e8e224c35549 SHA-1: a4fabe8976e15f47f31b0396c56ab71f67f4dca4 SHA-256: 680ffabf2b09afd6324263b13a9a36efa3f97bfac124e526b2497c92cfe69a45
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a tactic to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5501

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://pixomot.ru/uplcv?utm_term=emulator+android+andy PDF link annotation
    • http://csc021.com/userfiles/file/20210908192901_5nvmto.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/35562328608.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/99541236276.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/zuwegutaxibor.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zefapigefujagonogutoriwa.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/43272036344.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fff3bd27c---53557146758.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/tamosedokawosimebu.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/22168261366.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/1369181324.pdfIn PDF document text
    • https://renteci.com/imagens/file/11331707437.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e005117f---90005457099.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/girelipifuvoluxelijir.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/fibazuzejabokogokuk.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/45513910831.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/marubarijifemadivovakas.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f5a0a1ed13bf39ba1f99e2d8e7218fa/38555801585.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/rinapibinuzodix.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/38519039954.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/xunofenew.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161392b53c5b7f---82387458009.pdfIn PDF document text
    • http://www.bash.cl/media/file/63424994351.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/39096900123.pdfIn PDF document text
    • 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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 17780 bytes
SHA-256: 160b2db94870bdb5a8e5c05a1e6ba9a914cf6cb3459bdd5966073a92de0b3f2a

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