Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab42e54f263e4b86…

MALICIOUS

PDF

55.7 KB Created: 2021-09-17 01:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5d940b2882b334997f46d81f8919cb6 SHA-1: f95d2b79f1fc1b639c37c5093a4c5809c88e35be SHA-256: ab42e54f263e4b86ae46306e66df7d3ce40f94a4f0e8081a700d100bb3798015
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, directing users to multiple external PDF files hosted on compromised or disposable domains, likely to distribute further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to disguise malicious content and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7337

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 https://byocamacho.com/ckfinder/userfiles/files/39670970068.pdf In PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/80914992343.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402f640856f---gajeb.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d02f24175---xuworidufinezexinuge.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b7dd139c162d5fc916da4a090783f7db/mozug.pdfIn PDF document text
    • http://vhshf.de/File/7976660218.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/10901158867.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/42158484625.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/70770790589.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/xatuxavureget.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/zixejogadajareripipakuw.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/40567831130.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/gefavawitilerufanosipof.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345bbfe6e3c---22456994143.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210907224437.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/38169076251.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/10754722741.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/wusodukuwesamusexu.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/96097170280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+laws+of+success+pdfPDF link annotation

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