Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0f89faa8538310…

MALICIOUS

PDF

66.3 KB Created: 2021-06-19 20:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0ce85fa7da807dedd321590a244a367b SHA-1: f0b58103f6a8c2835b23423c614a53d431f0ebe0 SHA-256: 2b0f89faa8538310bbde907a3351299d79fc4136a811e76b796ca6b92aa71e8b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links and the overall structure indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4e66ca84---magaraferas.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223ba175a6---ludaxavazitotid.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/50660498899.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/tilipefibozajetepitusekux.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac191ae4533---32266074815.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5936d9b34f84286d2e5d27f6aec40a9e/76138455103.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/64d07dd8191783fcb6eb3e1431da5eab/volifufenuwes.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bb85af4db78b3941b02b20bb4285d261/vonufazivi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f6f99e10502a902912453ea1ce70c5bd/41551948122.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70c623f37---41626809922.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607863e4a8816---63164620915.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/xafinivonibara.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/48072817445.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/81953177421.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mp4hdmovies+org+bollywoodPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 5648 bytes
SHA-256: 894880d83e78d76fa532d42b0bada15dad51fedb3c08a593555fc824e4b2504e
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 11088 bytes
SHA-256: 9b4ee00f79bb1f6ea35f25184a2da7faf129cf2dccf788839fa10a307e54f79d

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