Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f823241223675b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 21:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d68692451e4df4719a205b90ba363055 SHA-1: 66ce8a0c58331720fa9f89bad8b03942154b8a47 SHA-256: d5f823241223675b62a6c335c3f4e59e9b3b7d146ce3b05968e446e22e5cefb3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6185

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://chcial.ru/uplcv?utm_term=ios+heroes+of+might+and+magic+3 PDF link annotation
    • http://jjmcp.jp/userfiles/Image/file/18487117299.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/54658159861.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/56812124957.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/27804239949.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/28805554268.pdfIn PDF document text
    • http://inphilong.com/upload/files/33905749258.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/zitib.pdfIn PDF document text
    • http://mimpiindah1.com/contents/files/13157371910.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/34817258984.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16144f4453005c---dovabegirujijofi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/34591974007.pdfIn PDF document text
    • http://thepducphat.com/upload/files/25231008318.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/rebatu.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/51978988989.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13109ac02---17933264726.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/35587137009.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a061254f---fumisapevazumotuzamejeri.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/lunepufinipuzavim.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/83356393519.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/99780092956.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/wexubulazope.pdfIn PDF document text
    • https://insp.biz/img/file/toramam.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/9150315528.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/8128624371.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/507a1440ae0ea96702592a2b850be646/37065275982.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_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 11000 bytes
SHA-256: 88862c3c76bb52f63f29617f9f5d1cd8df0da5879c5655bc9cecce53dac01c31

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