Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c08a6c2e14839c…

MALICIOUS

PDF

94.7 KB Created: 2021-07-24 10:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d12aebeef8bfc245cd0117bf19f011b SHA-1: 34ffc7fe6e34ab8e29d57494a6361cb6083a99d6 SHA-256: e4c08a6c2e14839ccaa33eb417ca20e3b6462ad4d64a60ba9cb3f46a5eb8e006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a pattern of hosting malicious PDFs on compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/48bqv24m67ed6oiumka7hpjpjl/gajakewiratevepa.pdf In PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607de618838eb---levofapuxoj.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/19402888367.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b147c260393---xulifemagulupepar.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rovedowi.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/68600978756.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/26819921966.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0028a4dbe---nigopirevik.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/nugazo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/61672824373.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/fipasomanenadekitalajapex.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/345410009.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/puwizupekudovaxa.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/55ada03d9390316fd0dedf560373d511/xefamuvulaperisadatex.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccbf85e04---14367988274.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/fowekegerejigufekobuw.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/cb27dc694a60f879b56cc1244924506c/11895050215.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdc7be860cc36fcac8a5bc41d5cf801c/giwanida.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7a3b9804f---juvuridumed.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc4199181---15343444747.pdfIn PDF document text
    • https://taperagi.com/contents//files/zuluzova.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/wijofowaloseluxemetos.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/17431023420.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ca75e00eb9480e2891f1511456272542/65834454311.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f800c56a0---tawibupitupogepebime.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/3tovma4t8g3d9u3do42bkbrhjc/23009833818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=in%C5%9Faat+m%C3%BChendisli%C4%9Fi+statik+%C3%A7%C3%B6z%C3%BCml%C3%BC+sorularPDF 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_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 11796 bytes
SHA-256: 9ce5b5342784b9b7c6e50baed05517ca71e0989f79465cc55a4cef4953579777
font_02_sfnt_off00013c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 18812 bytes
SHA-256: fe68d625eee9f76fb3396f0de7927eb740f3399842c66a5a1375c1a7b089a7f6