Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a69876c94afd19…

MALICIOUS

PDF

48.9 KB Created: 2021-09-01 20:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4e93c9ae4594b4aee5524579543743a SHA-1: 18f87f17d040b1c303742168daf39bcb45d9b1fe SHA-256: 37a69876c94afd193a6b6fa8b69b397818e2c41868c25923a9df79399cf2df68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8987

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://bright-inter.com/file_media/file_image/file/dumibotazubunowo.pdf In PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/devezodawanexiloduxuvol.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/56844907093.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/nuvozu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7d94eeb1---rizugigolo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/95258141557.pdfIn PDF document text
    • http://jawarakreasi.com/file/merusolivugum.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/geb6qnihusfvjkl4lqhlvj6mlt/96420470010.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97febcf3dc---wexozifenofuwodorupi.pdfIn PDF document text
    • https://777mto.info/contents//files/98127691009.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/86928044916.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/baa6172068da7fabbd2537e1277030c3/82738748102.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f04baaaeb58---58982576055.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gugokikobiw.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9f8292d3---50423993759.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/66236007540.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/sikilazijapukakexugumexo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/633b88cb1cb35811bb8929a72f37cbce/78398533581.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607065bb5bfb9---7637708055.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/1ba9ad9fdf96b50974e2c9b0c4e8a4e0/vowap.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0765670e---kiromerovi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ced17ce8---tefezuralezawogafi.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/texurerumagisexasibire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+zone+is+ohio+inPDF link annotation

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