Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac4523c149e714a…

MALICIOUS

PDF

62.3 KB Created: 2021-09-13 16:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13c56e63337e98c6e097cb79f7914548 SHA-1: 3e5d17767ed21d18bac664ac364c9a4f82ae7dc7 SHA-256: 3ac4523c149e714ac6401f1d0a88ac23487efc0370e1c07c6726d2cafd122fcf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9009

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://queure.ru/uplcv?utm_term=walking+bass+piano+exercises+pdf PDF link annotation
    • https://padservhosting.com/userfiles/file/24216317318.pdfIn PDF document text
    • http://short-story.ru/upload/file/xijegitavopikegexapabu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/timawapufidiwigow.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70f12232f---mitixevuwaj.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/629586ba8d8b819f60ae761cb1581ca1/gekajove.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/36534137785.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/fifoj.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/10/file/fulezoferododawadolokutaz.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/lakup.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/21903663340.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/67920448790.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/95632081770.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/n32q5ue1du21bb05940d97t9d2/18047612458.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210903_221730.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/adf2009f9988f953a8c82e57aa747b87/56916214172.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/jubeniwizutimujuwideg.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/3878702047.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/xojirugupuxufomiminik.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613993f01fbaf---zararuvonosizugotapapol.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613118511a482---vuwijuzo.pdfIn PDF document text
    • http://labradory.pl/file/89961389649.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f325088512---fajojog.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/25090081854.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec55adbd4a---39751680730.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 11024 bytes
SHA-256: 1157bbb5fd69b1bf9f611ca33d9ba4d7b27ebfe540aae0308f653113f998b36e

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