Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98d64ba8df4e6dc…

MALICIOUS

PDF

54.0 KB Created: 2021-09-18 07:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 928760aaafd4f78909d84c6aafb63201 SHA-1: 72c137f039745d72357de3c473e4fc58badf29da SHA-256: f98d64ba8df4e6dc5eebab3b4c73809df2250ca9f46d9ee2b9bf81e47653f734
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of URLs like 'https://cructi.ru/uplcv?utm_term=gmail+creator+apk' suggests a phishing or malware distribution lure. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8244

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 https://cructi.ru/uplcv?utm_term=gmail+creator+apk PDF link annotation
    • http://zuche0551.com/upload/file/besumanugowafesezi.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/rogoxaraxozab.pdfIn PDF document text
    • http://househouse.it/userfiles/files/gisobajugumurona.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/metumeroza.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/56746992422.pdfIn PDF document text
    • http://4bx.pl/public/file/40891079024.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/51972301052.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311472ceb85---48698917692.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/48337675452.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/puwemefifanenizuwifejof.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/61781002348.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/28635086332.pdfIn PDF document text
    • http://xfswchem.com/upload/files/76178687135.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/dedugimekafedefomaxatokip.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lojadekepamewevisi.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ve0fp169var4do1b72aq0qobs0/dilodipemoganoluwokotuku.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/biwelumubini.pdfIn PDF document text
    • https://swiz.eu/files/editor/36499850667.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/17514679409.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a16803868---57471237525.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/26645237576.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/vivobenu.pdfIn PDF document text

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