Malicious PDF — malware analysis report

Static analysis result for SHA-256 8710e93ee5fc6e7c…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 03:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0eaf1c2a697a5afafa495c731c7b9482 SHA-1: 6d3e67cc9e0403429c857dff5d635e8eec468409 SHA-256: 8710e93ee5fc6e7c6cd652d22470d0be49debf35677f5884eb96f6624d6af2fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=relatorio+de+estagio+tecnico+em+edifica%C3%A7%C3%B5es+pronto+pdf PDF link annotation
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4868d3d44fc5b15808bc3c149ab4e224/34782385614.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/pafenexiwametakove.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/dosedapomopoliwibow.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/loboduxedoxarowotowaputel.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f89a5143f---gekowevopu.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/jozaperivifa.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/70737687205.pdfIn PDF document text
    • https://foulardfotografando.it/file/lovexaxitajorixeximozu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/diluvetuponupegi.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/69488040566.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c90795b2d6---kokiligogazedurisi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f0371a58d01---23709644655.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118c6872196c---35828458763.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/setibefubapojofelotem.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/278ea75d95d125fcd8dde5f9366b7b87/ziwifokebirafalosur.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/79674023986.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607adba9a1c40---26204746461.pdfIn PDF document text
    • https://dm288.rs/slicice/file/fokuz.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/69122337664.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/57145823407.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mauc37kcuna25ags3egfuk85i9/wevotobu.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e7c9d8b458d7aeb5be317da1e4690922/15873556969.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7680f85edf9e5855004db21d8ad8be11/xelalerelurepemivadoxat.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/sh278dd3a6r8999b4bh77e1ge7/duzezurovapi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accefe9ec1e---6652690640.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/8e4c5dd3deb9bec56896a984eff716ad/kolegomis.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/70683296088.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_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 11432 bytes
SHA-256: 2a7940983956b6d45707c1503ed4f4e62061c805742547cd391700ddec1bfbb8
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 21092 bytes
SHA-256: 87cc4c56c00c72b07542cf22a31aa4cdd721d5d487d2570eae95305e62d600db

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