Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cd1362e19eb428…

MALICIOUS

PDF

55.8 KB Created: 2021-05-12 06:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb812aef7ac4da3497153c20d8630a9b SHA-1: 3bb983eefffffdce0616d88d72680cf4ead41622 SHA-256: 10cd1362e19eb428b7e31525a739a12cc1cf8113addabe8735b8fe165b62658a
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic firings indicate a link farm designed to distribute malicious files, as evidenced by the ClamAV detection of 'Pdf.Phishing.Trojan'. The presence of IP address literals in URLs and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6678

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848503a8f02---binetaf.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gekarokofesepufikugep.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607495b26ca45---40616069376.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/t99e5dmiealqfn8qmc208453if/72619409492.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/vukimizujuvusa.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/q9l758o8kvrs4hno6h0rsunvgi/38881756506.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609809632dbe1---pujexibovu.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/917dce27f7dd7312c8d2faad3de4d8c8/fugonajiw.pdfIn PDF document text
    • https://signika.pl/Upload/file/nomodasaxa.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609406d734abb---zawevubujowamusife.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a5ac784a4---puxujavojoganewejevivusu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntj12oi1hstdbdj892urtu8vn3/tafupupak.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501211558598842.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7967031b2---33055059424.pdfPDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a2a0e4869ffc33e00c706be5e6977d13/98964830582.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/106bedac9297dcb96a4d33d27c0a7ce3/2288276623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=astrology+books+pdf+in+marathiPDF link annotation

Related samples 8

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