Malicious PDF — malware analysis report

Static analysis result for SHA-256 89087256f5154696…

MALICIOUS

PDF

72.7 KB Created: 2021-09-21 04:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c3a6a420735bb2280529e695c43ea40 SHA-1: 38adad84a7d1cb436b67d034ce9449b920632997 SHA-256: 89087256f51546962db99e8fefd9b03833264dddf9e270e9f59e23c180a49040
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8679

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://linhngapt.vn/upload/files/81604334364.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/40198890352.pdf
    • http://munnarinfo.in/userfiles/file/sukububusi.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jmf1n4ic000q2pkft4ci135atn/raxadesusizadabu.pdf
    • https://udruga-invalida.hr/files/42678082133.pdf
    • http://offerparts.com/upload/files/jitalu.pdf
    • http://tareeapartment.com/user_img/files/xelamemizufoba.pdf
    • https://jasmijnbloemengroen.nl/userfiles/file/91812043963.pdf
    • https://soudurelauziere.ca/upload/editor/file/82555779643.pdf
    • https://ambient-interier.cz/files/files/36439932390.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/7106633870.pdf
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/67354343498.pdf
    • https://ourlady-schools2.com/userfiles/files/dizuj.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05a987818---56897241220.pdf
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/90577624195.pdf
    • https://kaplaitalia.it/userfiles/files/11483713103.pdf
    • http://e-park.es/img/uploads/files/18213796127.pdf
    • http://fullerton.kopanramen.com/uploads/files/mosuradetunurofidogutixe.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0afc76a208e0c356ae28931c98cf722a/20438845519.pdf
    • https://aviatroglo.fr/IMG/file/nokusatizalivet.pdf
    • http://stefanourso.com/public/userfiles/file/terusowofonujulofiv.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142708008b74---53579260543.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15228006904.pdf
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/piburapifo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=notification+manager+android+app
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 16792 bytes
font_01_sfnt_off0000f907.bin
638ad42f20bb275c21d87e6cabe360f860a573b07e7132b60cac07013699437d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 17436 bytes