Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2e8b65021c0a93…

MALICIOUS

PDF

66.4 KB Created: 2021-09-06 20:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e663479745f0b3c31a5913da42a6a68a SHA-1: 71ca22f0647a5ed6e524dc4369ece45d2f3e8de2 SHA-256: 8e2e8b65021c0a937c18db4b67aa3c6203460bac370c0b037ee64a19fc6470d5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves leveraging these links and potentially the embedded script to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7151

Heuristics 6

  • 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.
  • 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://embassyinvietnam.com/webroot/img/files/43618239061.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609739cc75df7---kejevosubinumezojikasubi.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/lixibisodojiwoxu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/50647983656.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u8ni764a3li1gpnd5tpgesca9t/kikelurejakupokemuf.pdfIn PDF document text
    • http://snft.ro/media/file/48309915580.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/d24212b06a33ac1100263a0da6296728/vuwafudega.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/limofidokaxev.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/datozizepibepegovuxapewa.pdfIn PDF document text
    • https://negaratoto.com/contents//files/xugagasanez.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18c2d4781a---28847266026.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/depoveriweru.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/sideponuweruwosa.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/74961837630.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/415061481.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/derebabumozupelidijujube.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/tekegorabexelatikonopapuj.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/81658683831.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d6b5588b68ad2fa3cf971fac88e5f1c7/dozuwakewezezebofinase.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1001ae0c9a8ef9c8e58fa8d13ce9cc1c/gufizixo.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/digulisum.pdfIn PDF document text
    • https://davnosti.ru/upload/dexazenaluwufe.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/gupudufudinotirew.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5f67b152---ziberunu.pdfIn PDF document text
    • http://ledins.lv/cms/file/54427649544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=seventh+chords+guitar+pdfPDF link annotation
    • 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_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 11092 bytes
SHA-256: d3f4f271249d4b9e07fc4b47ddef442e6b7bb61b2232bec7dc05d574e48b9118

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