Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b968d5f2146bd2…

MALICIOUS

PDF

63.8 KB Created: 2021-05-14 19:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f62faa5e134e20b1d0196bb71333709b SHA-1: eca6c58ab15eae3710178190c3d32476acad74ea SHA-256: e9b968d5f2146bd2a8988a40a240c28eef6297b716994d50f5e68121f811191a
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it's part of a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8701

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://chcial.ru/uplcv?utm_term=ccleaner+portable+free++windows+10
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607958fc37266---tumemaxasumap.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbedbd39a4---55648909549.pdf
    • http://volamtuyetthe.com/userfiles/file/wupokitegalavadakurazuf.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160720a19557bb---nufopobofusunuko.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3fe223ab---59490191978.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160711d1eea7e1---suxuxelesonaj.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23aab0822---94623361164.pdf
    • https://aawyx.com/sites/default/imageuser/file/80575420502.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/h0nicm6eiv38quil9cgdat1uin/xidobazolupedumur.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/dkn7f7uq5ord226psogp00oaac/megede.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0bcfdaeff---zawudufamusasojumifogeke.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/31e3cdf39ea33e05dbe549b7842cba91/niwoponomigowukot.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/rajsdtis6vnqbc3ghi1obli60u/jagupenibabiviloji.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df0b1e8ae9---wasasodujexoka.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d14187e0---11201644897.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cd484f2dd8e2e79aaeb1dc644f10e756/gimowo.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/b2960ef184e0a3dacf2fb23c08ae0e4c/25784156725.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60c.bin
2ef4fca0001c2d6c05e3e365642e815a95ae56cc2c8cb021c29ad90cbb6e88e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 5480 bytes

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