Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c487807bb793117…

MALICIOUS

PDF

63.6 KB Created: 2021-09-30 11:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c4e03d2be6fc1a2e6aa7c8f1aa7aac3 SHA-1: 61fdb649a08335f1346be34d534142f4ca598d98 SHA-256: 3c487807bb793117f8326e29ea74ae263707c81688cd7182e7308abaa65d72db
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a link farm with numerous external URLs hosted on various domains, including compromised CMS uploads, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded JavaScript and external links indicates a likely attack pattern involving user interaction to trigger malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

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://synerhu.ru/uplcv?utm_term=brutal+doom+para+android
    • http://podhoru.cz/userfiles/file/67708507868.pdf
    • http://djk-winkel.de/images/uploads/file/70270386445.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161345c20b45e6---60076671472.pdf
    • http://savvyais.com/userfiles/file/sigozikelobufefumikoku.pdf
    • http://korsorlampang.net/user_img/files/wotopawopavuna.pdf
    • https://cs168.tw/upfiles/editor/files/xoxonololi.pdf
    • http://matchedtubes.de/userfiles/file/fomidiju.pdf
    • http://ddaengshop.com/ckupload/files/1872811336.pdf
    • http://xyr59.com/filespath/files/20210903203443.pdf
    • http://levne-pohary.cz/UserFiles/File/wisugofasetuka.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/9s9jg2bmhnqvcvtrfdor91h91j/50971481844.pdf
    • http://napiarsaigh.com/images/761311575.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d88d1b8479---komuvolunonex.pdf
    • http://musclecar-taps.com/js/upload/files/gijejogenumukifig.pdf
    • http://racecross.com/upload/edito_fckeditor/file/jugofe.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5482cc4e---gamevujuwaluvubiw.pdf
    • http://emirates-offshore.com/uploads/image/file/47228647934.pdf
    • http://skrutit-probeg.ru/upload_picture/file/99229391781.pdf
    • http://mtegl.wsystem.sk/userfiles/files/bogezorabarum.pdf
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109111800517370.pdf
    • http://www.companyforte.com/imagenes/editor/file/padenopifedapow.pdf
    • http://wecans.net/_UploadFile/Images/file/bobet.pdf
    • 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_off0000ae10.bin
e8f37c78cbcd3bcc7cbca7a068cb6f48b8c946fcb590033ab690a96d5b24eb93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 10408 bytes
font_01_sfnt_off0000c589.bin
c5b8a721a890b92de6dc687512af5ec7cec949d9e373b0d4383fdbeaf1813fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 16916 bytes

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