Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb68383833a82c6…

MALICIOUS

PDF

73.9 KB Created: 2021-10-08 05:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7287b8bb07f20e599bb1ede1ed4a5fc5 SHA-1: e3423428e381c5921383759cf3e3e0b4fc6269d9 SHA-256: 3eb68383833a82c694a794c9ac3ee32ad1778134b20f9528cea717db773db92e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, directing users to various external websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=english+north+american+accent PDF link annotation
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/nofufabo.pdfIn PDF document text
    • http://lagrupacio.cat/file/defeguwitexinonusikubi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e72405210a---wawewufukogit.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202110060703257388.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f9820605876ed6ca5cf2726e3ca80f5b/66616573239.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/jerumepilezimoxu.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/xudobupovoxejaxa.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615f6ee39f691---56269141801.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-08-04-33-24-27.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b732835128---6981631478.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109221306017601.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/sebibapupibumuzigemutixim.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/vuwubezojomazufeso.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/34877035438.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/rubukobepezelawikuwaluvo.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/ziwen.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/buvatesezomobisoripumiwu.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/bokifugobuwimakedorojunor.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/tugewozunagepiga.pdfIn PDF document text
    • https://gilbertems.com/videos/file/sivileworitijamabojumir.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/vesagafamir.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/lamisifajukitela.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/zovidizozimomuso.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/94002371292.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EF 10660 bytes
SHA-256: c94ac5ed2792fef66e617600a71c5df74869b32dae63355bf2a6abd773b1ca0e
font_01_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 18824 bytes
SHA-256: 4667194498bf7f764e2f5bbcef0de4231c7f3185bddbe3e9e29e56dbe448e081

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