Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca1884891cbfbf4…

MALICIOUS

PDF

88.0 KB Created: 2021-09-09 08:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6abed11bf138b6a684647d4b661e135 SHA-1: 2e1c0aad418e142ab651f7e7a202399b233f6bd0 SHA-256: bca1884891cbfbf4647352e01f7ca946b0aaeadfde9386165fd65b89dfd581b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage, likely to download further malware. The presence of numerous unknown URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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 http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613753ee7eb04---kagemagu.pdf In PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/lotunefikot.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/kezusumufevekuk.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/kibikefufut.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/52274445698.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/kusikimo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba0cf31ae---81048543674.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613082fa5d5f1---mesafegaroxajefi.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/48892225196.pdfIn PDF document text
    • http://coolscape.info/images/files/74059263872.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/1376959434.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/58552858272.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2ce26ad71d68be59b6b442ea41ef1744/tesufozobibusubanaxumazuf.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9abd2e6a5e5a50cf4a90093ed5890bdd/3354050474.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/43733796170.pdfIn PDF document text
    • https://777mto.info/contents/files/fibip.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/11598188020.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/fuvemexosawamip.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/fugapabilit.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/bisigazu.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/34043445745.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/63275147693.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/97875516253.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/fagejewinigegapimejubuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=zamob+free+music+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 10828 bytes
SHA-256: 753877e018623e50d2dfe34c9fa743fbf68b11c643c6a68650303f43b3bc275b
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 17632 bytes
SHA-256: 8f51b8c2cab8a6dbae26b4a5d7ff9374df81b1a3016cdda9d760c218f1afb4da
font_02_sfnt_off00013a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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