Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6609d7d4944d802…

MALICIOUS

PDF

70.6 KB Created: 2021-09-03 11:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 913fda0d38c31a649aab7146bc2e9b23 SHA-1: 4838423fa0e3fd9da910348258a0b0a9a8eb0431 SHA-256: f6609d7d4944d802afcb974977e28bed20a85a8871747179ec3d324abe7e06b1
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting, designed to lure users to malicious content. The presence of multiple links on compromised CMS uploads suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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://ahlhy.com/uploads/file/280330348953.pdf In PDF document text
    • http://wo-kop.pl/userfiles/file/xodasesegunuwonododedur.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf87fb7d02---pelajunisesotadapuzuvakir.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/818a84b987de7053fab52108143866e4/lejivaduw.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/47571882193.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/56dda679cd939f9611d58aafb0dc9450/wobuj.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608255bb37e9f---muguvubi.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/71976581442.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8b7e5c1816d59b1f5deaba6492454d2c/16234946457.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/sorunijuw.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/78336407195.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0ec5915a---rovige.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/mopugufelunaw.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202108290730017514.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/81016056316.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sugutujom.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/65121214503.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/2374879845.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/xabevof.pdfIn PDF document text
    • https://europartner2.pl/uploads/67855709009.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7b15e2333---41272259630.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/18126151285.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774f562e925---puxidixotewakaferej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=questoes+de+concurso+portugues+com+gabarito+pdfPDF 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_off0000c7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F0 11216 bytes
SHA-256: 5a885230ed2ce786a55778aed3a067706c32bbb9e0f1457a9d56773ffe742f0f
font_01_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 19808 bytes
SHA-256: 3b740fdfd92ea46991ac26baf93c34c5f85fb848c0050aa5b9523ff160d82ab7