Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cac4e569872ddea…

MALICIOUS

PDF

90.0 KB Created: 2021-08-25 19:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e3845675a1880ec922f17ab34f68a1e SHA-1: 901819c564ddce20356552f3adcbd446c2091ade SHA-256: 2cac4e569872ddea462d533df1a03c33e1dc4972c19aa361d97785004f3bc5a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://puppometalli.eu/file/fadawizoposidosulo.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070027d70f2b---kijowemamovofuvomizaz.pdfIn PDF document text
    • https://hgb.se/filer/file/botonigefikusu.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/92268133815.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/goxunirozufob.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/1400225924.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qk94qgm3pfeog83h2vn69793c6/sobutinopeduvezokaxako.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/37532812348.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/relob.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/foxaxuxifuzuxazes.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b205483b9---lazazak.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/loduvubosafumow.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2d0f84f36c2b65a93f15609b100ad9d4/lipoxajofuvagibibotojit.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf46cd186---jalapiliromogutedafili.pdfIn PDF document text
    • http://ezibra.pl/upload//file/5607306224.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b363740ee03---78548088792.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/zadixuxuvedagejozunex.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nozused.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/419d74c7c80962962870ec64918c2ef6/12830408912.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/jegevalazunev.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/eb2a4c007f08e219fe371d67b3447e04/kurogivituto.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/sezuwixebuvefegisago.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b903a245---xagefavolebeben.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/pebiwasariroku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=explain+the+objectives+of+pricingPDF 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_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 11180 bytes
SHA-256: 174c6ac4f530428d4e21e629310498a60083634cb6508ec09fe695cb8f3ffd4f
font_02_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 16560 bytes
SHA-256: 8feb4e17346759cad34a5e2e6c3a98e39a7d998cec8f66836b8b6d6b3c0280e0

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