Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a663a4cf0ef520…

MALICIOUS

PDF

48.9 KB Created: 2021-07-02 09:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e6650ef1c8e64a412b98689f59cb85f0 SHA-1: 48a56f68cb832ccc73042c8e01fa75da5a7d92bd SHA-256: 31a663a4cf0ef520c7f4f4e7aeaad12835f52e049ae2203eeaef647e37ee24b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with a phishing lure designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8963

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4837d818c---48551387708.pdf In PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/34671425897.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/24813369987.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9340a4e7---70254263515.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a08ed9a13a3---67428919250.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16082be0411c4e---mukasanewut.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/uo1nvcn4rr48ev5r1pso1lcnjl/xovajob.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1544b3aff---97456620115.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f411c914d---5742953927.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qc9nu7r61ccttggcerepdel7u6/sotimofaposegekobid.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d23224e42---7912842568.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/51423c69cd46de3b4a140b274c845608/38929376588.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/91714279708.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3v1fn3vceqksfhs41k80gsek74/24025542892.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/sorewurorotumukoxa.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/24816432542.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qka6mis5g1l1nlic8j50ha2fd/bavoxo.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/jizewukibuzisa.pdfIn PDF document text
    • https://faprosid.com/file/mexanubumuguj.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/15056394946.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/93079000033.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/46498683063.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/vitonopavupezuvukomi.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/45670728032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=trifles+by+susan+glaspell+storyPDF link annotation

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