Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c767a027ec8fae8…

MALICIOUS

PDF

59.1 KB Created: 2021-09-03 14:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e7d2cc4ae8d19c72554843681112cf8 SHA-1: 2eab3bb4ee369c538d6046f92f88137696b348b4 SHA-256: 7c767a027ec8fae888f67056727d584d4d0cad949c2b7bbc5aef6cc70b705d12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5305

Heuristics 5

  • 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.
  • 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://koszyczarek.pl/userfiles/file/fiwajugitubukirijo.pdf In PDF document text
    • https://murten-hotel.ch/userfiles/files/19986295482.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/83023851328.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca98459e31---41526960894.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/futisusonamumitepufejoko.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/j2jh9v8il00vbotm5qgub8b914/92867610505.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/84519436838.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/8524271982.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b8c48527f5ba3f17661da42b5d681558/60074684097.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210728_0CA6CE9CC561500B.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/25609339381.pdfIn PDF document text
    • http://vhktn.at/images/content/files/7638018554.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd5efc7df1---65588956074.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/farapomedowedelexotujemud.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0692e4da---ruxoka.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/12282933305.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210619065308_1818032051.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/bisuvanojemez.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/kuluwepa.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/11148310106.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/wimisowoso.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/tadetuwe.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcc4880c7---46332988911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+editor+software+namePDF link annotation

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