Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baa2831f96ce774…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 17:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 539809715839d2196b5f2979b168c0ba SHA-1: dc795d1bcb66f7aae81ac6d829cf0e4ba79b96e0 SHA-256: 4baa2831f96ce774492a820e5f327a93291c5a03b764caf951eb9634a3997345
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the nature of the embedded links and the overall detection suggest an attempt to lure users to external malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=urinary+incontinence+meaning+in+malayalam PDF link annotation
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb4427d05a---31823569710.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/h8vs9cpmrgf2qui6l1jhd588gd/lupitamesunanobisusorive.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b176a847e---10695358567.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/m6ke3saejb6ajo48ev9pjsi097/95692934291.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/32rd8li6c2cqnpko8f31h45jo4/33528379577.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/bavodevadad.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/svju7gq2avh49u8pmrgchc341a/xidagatarejivenukajolozop.pdfIn PDF document text
    • http://azizolace.cz/images/file/13580655341.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8unpf9ds1v8hh14be5c1fqdqg0/nigugurepum.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/447043222f8898a40fa092f703d772f8/sifiwax.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/gabemulinuruxewuvodido.pdfIn PDF document text
    • http://apvn.info/userfiles/file/wamukofuk.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083156a32aa7---30000459155.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/24041514573.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/vepomevubogejik.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e946415fb---pagekawofokulimoluxo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/79094741796.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cf14eeb28fe6abc497170a8e044e947b/23070880791.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2438a44bbb6b6d7fbce92abc07fb2c41/37975318947.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/38846856542.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/36806251760.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078b750e1104---punilupem.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 10524 bytes
SHA-256: 123eecdd80e727182713fee58b46d99e27ac814f6b860a4330872cd32e85c34e
font_01_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 17788 bytes
SHA-256: 41671623936c03b0c1622dbb5e9ec39778bcd220c919b715149882f26522aa39

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