Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d703de8a79ab3d1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 02:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae923534df449f02200b41f237c774c7 SHA-1: 4c59998247c4080b10b2a6a2e8885d0684d11942 SHA-256: 8d703de8a79ab3d119173602157519308a64e3fbd85f617dbb1929992b259b11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many distinct hosts and links, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7500

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://liniagdanskzydowo.pl/files/reguziniwazuvav.pdf In PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/qgaif9m0nmrkpj2q2k48snop7h/fusutukase.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/77c944cb3dc152f209ae9b20eae7b187/wubano.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6038cb6bcc---rigowugojopodufir.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdccabac79---40095692152.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075924d06151---50629329278.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b780bbbcf4---zotajikidapobuwazalawex.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b3e5b827---66522445112.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffef814507---46713660967.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/10191639187.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b99b6df3e---1512570518.pdfIn PDF document text
    • http://matras-devison.com/upload/file/67926241291.pdfIn PDF document text
    • https://digireg.es/upload/sakiwezani.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad013bd2840---28749090197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fly+emirates+first+classPDF link annotation

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