Malicious PDF — malware analysis report

Static analysis result for SHA-256 677df9dfa2323eed…

MALICIOUS

PDF

140.5 KB Created: 2021-07-19 01:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b9caecbb55a093ada44019d6a7e632f SHA-1: 3de05efd0fbddf7a6a98d829dbbb908e74afbb75 SHA-256: 677df9dfa2323eede9e968c910642ce4f3ccfbd7f83956c44ea23a7b0c4ceac3
132 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is likely used to redirect the user to external URLs. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3318

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/4d94de0b803032442916f73e4ae93661/gamod.pdf In PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/48825512335.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0d480e281123adc830d3040221ba2e5f/8643585146.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/5893971171.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/zexolidiferumopa.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/14/file/20210714_104559_194.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/56854871801.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/16511209695.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/juzapobofejutatozuduwak.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa2df06b9e077bdd03bdea0995f2a994/65010066307.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/30591438002.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eaece214e---43445813904.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075749ed7026---26764472037.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/26966316693.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/22700153783.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ee6616fed7fb708df0414c6dc96fe4f3/kelasifomerixoxa.pdfIn PDF document text
    • https://mytopics.it/uploads/file/wotipe.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0cb02a090---91164977523.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ronesuzuzedozoja.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/17293104063.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090fddd1fbf8---mejisorubufexovesopunebo.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162278715224.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/66294609186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=class+inequality+examplesPDF 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_off0001dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBCB 18424 bytes
SHA-256: dd04148195fa64fb05c2e6973710766e1b7d92f57b68051e3c06b00664fdb059
font_01_sfnt_off00020b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B58 10688 bytes
SHA-256: 998704b1a73fb5bb1fc6e20bb8bdfa099e968cf45056aa0d60c2a29ba8ad536c

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