Malicious PDF — malware analysis report

Static analysis result for SHA-256 20be0c4033dd6fa7…

MALICIOUS

PDF

80.4 KB Created: 2021-06-25 01:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6df6b2929bf78a70bdde7983fb4e779a SHA-1: cabe71a6e514c8beb5aca287c613c6e60a56ad80 SHA-256: 20be0c4033dd6fa76f9e6a8b1eb991f87420e41f6bb0564893200a044c87da16
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 0.8828

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://stallion-international.com/userfiles/file/50920382696.pdf In PDF document text
    • http://xetaihyundai.net/upload/files/41271944271.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160843629267ec---gozozesegobejivuluvafufa.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0eed1dde8---jumonimufegoxo.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/bosizogalujimonopixomazip.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160765e0d81e4c---rozoladive.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/i25j7ltqd661qv63gpoiv1am9g/5965504350.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/10mtvd4b6vrq1ni947h41ljqe4/pewoxibutepezotenebakiwud.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/givifakazoribevikumo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9fcd7708b---48370104837.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76626a389---19804042431.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b3156eb19da---41897933928.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d8aa601ce683714360f76acfba25f6f7/66429534085.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082d97aed791---19404373782.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/15879162683.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bc3dd890f---47283067816.pdfIn PDF document text
    • http://contelex.it/userfiles/files/budasomitaxiwisekudesob.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/tutiserekanefu.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/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chanakya+and+the+art+of+war+pdfPDF 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_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 5084 bytes
SHA-256: d0c2c66cb978a5f3d28cc3b557c44822a22fd75b6b2ee1ac5a839376dee3ef74
font_01_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 11076 bytes
SHA-256: d27732fa4f7cd981d6d54d32647fda473c61886010eb165dffb33bd7e1175dd1

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