Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54a5e7d6d1cdf85…

MALICIOUS

PDF

66.7 KB Created: 2021-05-31 11:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8242f111a5bcb3c4ff538aa0f339af4 SHA-1: f90a892edaeee8045c32adbc99b62fa78b9ae56f SHA-256: f54a5e7d6d1cdf85e7dbbc70f3eb72013638512634a6ecceb5751c6cee86fa03
154 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The sample contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate the file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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 https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/414e211fbee806bb845ec0664bffa836/wixej.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/78d341267acdc94655414847d18c63fc/garagejedofawapatidogobok.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/23b8236dbbd91b6d50c8d1c0160340db/kagesitisepujavemowedupe.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607060527bd8e---pigajujirizolerenoxis.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/279fd85e400cbfb60572d115f52628db/23362174108.pdf
    • https://bkht.vn/userfiles/file/63554023125.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8279aec728cb2f3a315d44d78cb0c8ef/97297097424.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e554d16a0a8305bcdd5b3799ce05aa4e/votug.pdf
    • http://aplus.to/userfiles/file/67538056796.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160800e92e476f---nojavakogokavodugiret.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/78d695213e706ba48b66a85e7fa2ad63/62688124332.pdf
    • http://animationcoach.com/userfiles/file/xowutusanusuxogugugiluze.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/df3380ec0a5514f6579c3345ea671e15/86654655611.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609b718fe4e3b---7732148628.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=isdone.dll+error+code+11+sims+4
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad3.bin
fb414e2a251302249ebdac64211cd522f45eab251347234ccb9bcb8d4fbc9e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 4692 bytes
font_01_sfnt_off0000ea97.bin
ecbf555fc4581ad14ed8e06a84133ed81c5deb91149f1c7b5fefa8da93eb5552		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 10440 bytes

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