Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f707fdef2d0f247…

MALICIOUS

PDF

124.8 KB Created: 2021-08-17 15:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d93b01cbce55a576fc60b747d452975 SHA-1: df5349e212725d228b3876808d822c0ebcd6b82f SHA-256: 3f707fdef2d0f2476bc17846566d5dceb77d3800d9d527b8c62376fa13a74b06
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. No scripts were extracted, but the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8509

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 http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11754eadc4---45482013967.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/k6pcbrqh7oqi5dlvt379s4ap5u/kexesuzerobe.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/nfknvoto0lbtgqe7mfts22ofn4/luvinekodamepades.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0cfb88b6---fujunifaberoxafabodaliki.pdf
    • http://lycee-elm.org/userfiles/file/41413221524.pdf
    • http://urjabatteries.in/userfiles/file/jemufujepixijoselujaneke.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e211e342d6---wejomiwud.pdf
    • https://aduanaldelvalle.com/userfiles/file/jozosita.pdf
    • http://apexibd.com/uploads/fck_uploads/file/fetij.pdf
    • http://czdashan.cn/uploadfile/file/2021070808375873499.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafedd2175---29532545546.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bd8fe754ddb2d962a2b25746e02f2050/43539545224.pdf
    • http://lezeckastenakosice.sk/upload/files/74586079878.pdf
    • http://narcisse.sk/editor_uploads/files/kemuvugatepevupesi.pdf
    • https://businessservicesuk.com/userfiles/file/69484960487.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0aab125f---76932659976.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff8958aef---73523596512.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/a26b21ad5ddd3ff4301dad65c9de4657/62026637665.pdf
    • https://artinterior.bg/userfiles/file/37961499498.pdf
    • https://embassyinvietnam.com/webroot/img/files/80233625061.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/89728606887.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160773f6de6ec1---29515980329.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a7ba04cfc---72255469364.pdf
    • http://andrelandberg.com/userfiles/file/81590994862.pdf
    • http://studiosiriosrl.it/userfiles/files/xofubexazolomupapegunu.pdf
    • http://originalavto.ru/userfiles/file/79855727412.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=edith+piaf+ne+me+quitte+pas+lyrics+english
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000191d9.bin
5c85ddf455b712c64a9f4fa280870163b4a1aa0a37785df4aaa008d2f9aefef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x191D9 11288 bytes
font_01_sfnt_off0001aba6.bin
c2a3b42df3ffeb93d6622eb26354868fa5ca67260e9358d45bad82e548ba5651
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABA6 21296 bytes
font_02_sfnt_off0001dfda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFDA 16792 bytes