Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fc381b964c4b78…

MALICIOUS

PDF

64.0 KB Created: 2021-08-15 03:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 8d7756dcae1e65e4c5add75d82151c78 SHA-1: 106d69cff502fcefcf2149b5a397894b6ffb06a4 SHA-256: b5fc381b964c4b7843907c1f6119f12c9cbbf15025fc7662bd5cbd3838b3e013
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9489

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://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/0a7nkndcsb5q7l0if344mhgqi4/97210040854.pdf In PDF document text
    • http://guerrazzi.info/userfiles/files/jojideweriluv.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/davitazowesek.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/17eqeicbt2u2ot32ilnescb8e1/busipawalaluvat.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/6204334186.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa521c72e---lutuj.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e47b43cb3---leloduxo.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/13460511294.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/80231660302.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/11edfcb2da9acccc31d86368b99dc251/zosekateguxa.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/rigumora.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c07146a4cef---vonafosiniz.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3a2vm1qglqfu1gm8dm24c6cd50/jajupemeneliwuj.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083356a543a0---30704912531.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ed092dc3---12934053652.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/96092391622.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/95a6f37b9d5d8efbcd5f0b4c63f60484/77190456527.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/24207338221.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/9352474965.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/44050610232.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085cca188d63---90194227690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=list+of+5000+advanced+english+words+pdfPDF link annotation

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