Malicious PDF — malware analysis report

Static analysis result for SHA-256 927e53531c8fcca8…

MALICIOUS

PDF

59.4 KB Created: 2021-09-04 00:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7648badb96cb4652b9ba5e57d999ef3c SHA-1: 984bd8e5ab457424b44f65dc1c086f23674f33aa SHA-256: 927e53531c8fcca853bda6f481e1652374e224343c5f50db460d278be4e38a6c
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, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of these links and the overall structure align with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6589

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://allytemp.ru/uplcv?utm_term=quitar+contrase%C3%B1a+pdf+estado+de+cuenta PDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840c94d533a---kiwarataso.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/39394459143.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c28585dce2b---kanolijekepuzi.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/26639347086.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cde25f137---tuwobevupusipevubokozas.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd3638b7e6---4113642807.pdfIn PDF document text
    • https://paperland.bg/uploads/file/13695551853.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5db4e17b101aab57e5edef7fabe752c2/kuvinululomizilagogi.pdfIn PDF document text
    • http://groupkaishan.com/d/files/67547560232.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff6be334a---mibirasaso.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106010800388888.pdfIn PDF document text
    • http://teplospectr.ru/images/files/71322151762.pdfIn PDF document text
    • https://olterus.com/contents/files/82093519064.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6i04iq05tf2a5rkc854daf8p13/wituseda.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d00a754c---kurixolujizadigoxadupor.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/77823440293.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/44113995716.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/dageredibajakebum.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/92cdb025f5151f1e58bd8c89286ea966/68474774301.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/nusalumuxo.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/13569316683.pdfIn PDF document text
    • http://budropol.de/Upload/file/bowig.pdfIn PDF document text

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