Malicious PDF — malware analysis report

Static analysis result for SHA-256 8969dbe8608c8ccb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 20:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1b98dce0c65bb6b8ea748c09175c594c SHA-1: 4067b9dacb3e745b6f93e13a23d83ced2e4c2b02 SHA-256: 8969dbe8608c8ccb60442c4c6d3540eebde5777b68d18d2cb4f79f5918698c85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=our+sexuality+crooks+14th+edition+pdf PDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b16db9e71---3215177398.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/jenigeziz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613366cbe1f1b---zotanafumajojalizajitalil.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630915577/file/99759164508.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/traiotu5hf4j4pr37f9h3njp7q/sonoxeluxuregew.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b467868ac2bff43ea121e8c49621e669/sivexif.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/zumabuwaboki.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/nejumukobaleduvejitiminej.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/80423218311.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/31494154170.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/6179286534.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/75828295426.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/96175824046.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/19772730126144de01a6d8b.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/91962602987.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/70672079955.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/2297364052.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/tesipon.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/basujefupubogavumi.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/jesobutof.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/76231414763.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/lajafufukexirazez.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/42346264685.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/36379926229.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_off0000d318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD318 11280 bytes
SHA-256: 123916d069a6ca65a236d5c1d1417c71aad2deb43b1f84f4d8451afb317276ee
font_01_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 17748 bytes
SHA-256: 2fc732ae1d1c3b3b1fab09fd49f8f9b571eaa0414b8e7861facb695b4e53aef3