Malicious PDF — malware analysis report

Static analysis result for SHA-256 84acb36b50883b32…

MALICIOUS

PDF

74.5 KB Created: 2021-06-15 12:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 757ae25700725cd046a4fcfbe9a661cd SHA-1: 1dc73ffe8abb5acf6f88133564d988a990971590 SHA-256: 84acb36b50883b322f5a35d61e7db8ec00d8b068aea95259c9cf574bbe356bfb
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites, likely to host or distribute further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://wastran.ru/uplcv?utm_term=brazil+song+la+la+la+la+original+mp3+download+mr+jatt PDF link annotation
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d68e78eda9---bujedapuzorulofagofux.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/90579228804.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/649709e40cd5cba572b25556cfcc9ee4/xefojidodowasukipasoziz.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/l0mbibmj42sn82iuv57o7316pn/javibavodobobire.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e5bb3d0647bf4e5b1722c543a8340be/detagusar.pdfIn PDF document text
    • http://nktrading.qa/file/files/80131667667.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tewinusaf.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af809e827c0---wujulutetetejisodufito.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/betodagikozika.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/11581946282.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6c17baf97643175f7be3e5a9e2dfacfa/15030092540.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1249f1f6c249bb22cba778ec6d40b691/bowebogufufujedibibumel.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832eab3339c---zifuwuf.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/251de4fdac96737979df03be62e88b1e/dipogimonazeweb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 5712 bytes
SHA-256: 0078408d67255ae870961b7c8c27dad324f412d9e11611298370365c4f3541f6
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 2468 bytes
SHA-256: 06db5a57ea8788f969a2a90d7c2e37bb6758191cc37cb57cfce7f63857b235a7
font_02_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 11628 bytes
SHA-256: fc969d6839f6f7fe2e6367aaa706b98a2d6207978c3158979c768a8f1be88f51