Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6193cc1dd67610…

MALICIOUS

PDF

76.1 KB Created: 2021-05-15 02:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 81b4f62183b9d17398c3119c635a0789 SHA-1: aab938a0cf61079fde70f0e08f6acbcea36eef02 SHA-256: fd6193cc1dd6761033e13eac85ff3de14a3e77356f3c4790494bfca3ed42a6b6
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, but the presence of numerous external links suggests the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9654

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://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/60ed49d56d86746e8e18c4be6a852fbb/lapefemiwowazodezumu.pdf In PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/2huf7ks09ae51mj0hfhfjpqfj1/xibofikiv.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/thf1mjsaobdj0gmc1ppn6cho00/wowalejufumun.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db90d99546---besorak.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16201816128583.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/jjr5phg8ln69lpamumg573d26j/11220911712.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf9a89d6e---68538127823.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/boxalemewoxuwelusupulob.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb68788635---40696864509.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082aaf455850---34657265961.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/b37fdnqvo0ui6l83csphfats7h/mufowawuzokamizisoluraj.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/cf7671f18eebd0d43d8aebe2ade5293d/90130823748.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/238a8987b4b4d8e7a633d8cc488bd159/74653027504.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514151234178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=slideshare+er+appPDF link annotation

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