Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3131a3946125d70…

MALICIOUS

PDF

61.6 KB Created: 2021-05-11 04:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c000bd6eb05ae736849011d74cb9342d SHA-1: 6e08308998959c30c8a8fc4d5548dde8cfc254e7 SHA-256: d3131a3946125d708ca5f021f02d2990f6984529eacc0ea02b7e63ead544ed6d
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.
  • 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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8ff31712---4926575651.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ltv13tuggs1n61jvgpu0qhf5pp/ruvibikalodawerikiw.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/943f87ed49f715cf756d5d144ddfa2ab/1317766076.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ee9f3c49bf330a27d979233af125a163/manul.pdf
    • http://atut-biuro.com/uploaded/file/fedezomokerisolopepag.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e65cce0a6d30d14788129d805339f0e0/76905805438.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c52290765---guzugixavuvijatu.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7pa24rsmjuho09qlb59pveubfr/40005741134.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093c0386a921---firotipef.pdf
    • https://planet-for-events.de/userfiles/file/85019259950.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768fa1e2caa---34959107814.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7fa5a2c66eea9c270e77f924a4377ec5/dumozesevos.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c666ca4514---fejaluf.pdf
    • https://anfauglir.com/images/file/45538662896.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/647e2224c3511705e9a00d56dff9ec1f/mimepa.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d2da2ff5---wisupogonekanebiregavazo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=general+electric+renewable+energy+annual+report
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2fe.bin
711bb8b91ccc817d88dcb496bbda5fbf7fae0d7ebb51c668eae7ab9c29c23908		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 5288 bytes
font_01_sfnt_off0000d520.bin
461bc0950dd6577554a998fe92c296da2c3d93bf30547d34c51363c4333b859d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 9612 bytes

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