Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b10e10125a8bd97…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 23:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51b800093b1be28d6460a041e78d1eb8 SHA-1: 31751011d60b32d7fc5c6f7c38d8a2359aa46dff SHA-256: 6b10e10125a8bd97cc23a10ae50a1e45e52f2d8f0293b5b2a6e59db330cbe639
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e1bf1a83b957c700e76b229c329f1c33/44990422648.pdf In PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b91b9f3ee21fb653fe645b8277bb9b89/50471246437.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/4219539740.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda68cd57b9---novijosulefit.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/63385316682.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/famepefoxiboxipakoze.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/s76cqjra19q46294pkjtsd4i62/78754190591.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f7c080a1---dedudabaxufibus.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/046c864272bcaf91b6cd088d27f0c6bd/40455069495.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vmuup17q4607a0sv55c101din7/20074118243.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108172233023351.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/lobudelege.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/40745007487.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/k2ilhvhfp77pahoccl8gspq2cn/14747292348.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5979dccbcd757a852d642905b4b6401/16135166539.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/zojusuvimawoxopiw.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/kuwanipakoverudelis.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/ruzidenobewapoziwapapusil.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a501f5cfdba---lulovofirivawixofubit.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/febufikitirudekekobevono.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/18211502427.pdfIn PDF document text
    • http://atek-ent.com/upload/file/42869830743.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/93063589334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sexy+photos+of+catherine+bellPDF 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_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 17092 bytes
SHA-256: 4121ff8677eec30526b1dcfb86c3b1e96b2d98e52d9a1aa455d303d2bb05541d
font_01_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 11008 bytes
SHA-256: 8e06cc16d88bf4dad1edb68922b33001029ba60add939808967f606399ece613
font_02_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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