Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3371791e9524012…

MALICIOUS

PDF

62.6 KB Created: 2021-10-13 15:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 85a4a6fbbd4d8ac83b6762fb3e956679 SHA-1: 4193c54692c7ea272b912ce469e363f4f42a0e7d SHA-256: e3371791e95240123624e8d1fc0cba74732011ef5a6608eeed969ed3c43e0815
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external domains, some of which are hosted on compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing pages or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7374

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://phone-server.com/userfiles/file/kotutegajorivufi.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16159ae5f8b523---74679551258.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/66375763359.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/galulanoxifasigano.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jetubarupajup.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/43284448994.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/sinimu.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/61844614769.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/47759889313.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/dexefaxabojir.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/31739909838.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8b9cffa392614f898c24dff789b23507/pojogitivapoxalofofixukid.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/sanosudiv.pdfIn PDF document text
    • https://angkalaris.com/contents/files/mukazoguzufej.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/bosojumamexiliwetanibore.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8b1788624---tujinofuwijozokubaxuju.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/livilofakivutuzurafoxoxav.pdfIn PDF document text
    • https://8-hi.dataroom.tw/upload/file/rigatekipo.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_CB726834A240DE4E.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/zobemabimofovaz.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/neribow.pdfIn PDF document text
    • http://my-glc.com/uploads/file/19783386713.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/87843531013.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=carnivorous+meaning+in+englishPDF 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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 18076 bytes
SHA-256: 5de1144708e6b4800b2e6a9174e8ce0ab1c047532718ca9795fc8ff44b2f4f5e

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