Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4945993c73b3e4a…

MALICIOUS

PDF

92.6 KB Created: 2021-08-24 15:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fad5c3a47e72a1787e8d5aa1d6f90919 SHA-1: 729266d56ecb1ad92fc269bb9912d79e71a5357b SHA-256: e4945993c73b3e4aafa457a6b01ad3631b546b81459261ab1c878d78c81d7136
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The file's structure and content suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cructi.ru/uplcv?utm_term=2+day+conference+agenda+template PDF link annotation
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1b3dd22f1143c566fd1acfdc93a84cac/lupazite.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/32172726010.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/11708629712.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cf3aef3cc968bfc8e65ffe3b4e3d356f/18064158255.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/o1h9rb91542at17i4c60bu6kme/93636330078.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce458a740c---jupine.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210612060809355241.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/90898857443.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfe662e7b5---99764207683.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/49060434797.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/kotosin.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/pakelubov.pdfIn PDF document text
    • https://superpart.com/files/wurat.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/38723945033.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/7374288446.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41b3ab8c2---31638748788.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf2937ad7---migujomegagafiwoderiwolo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7e29c2799a69a393a0123f75475acdbf/lewobotinofalu.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/gotuzos.pdfIn PDF document text
    • https://maturana.cl/upload/file/17000721076.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/movojopafemetew.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/75071786646.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/42160828493.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/zunebowut.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_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 10840 bytes
SHA-256: 336073985239baa73a9e06db2618fbe9d63e39abbad50936cf9ab8b0eec40b7d
font_01_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 17000 bytes
SHA-256: b634b54f678909fe8cc9c9d5897329f199a32667278a313bbcc030a5c6be5727
font_02_sfnt_off00014a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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