Malicious PDF — malware analysis report

Static analysis result for SHA-256 df51bf7cc2ef3606…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 10:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8cfff19d45531970d4237dc9c56da3fb SHA-1: 12af30d2fb28da56f5e1080725dbf107d2024f78 SHA-256: df51bf7cc2ef3606ff9f3418a46b6fcb3345927ea71a9d9db7c3e1180a960a39
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://pamatudarbai.lt/ckfinder/userfiles/files/xojevugekuvatezujeve.pdf In PDF document text
    • http://banghetretruc.com/media/ftp/file/mefixilaxulavanelivivaz.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zorureziguvixutevo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8bf643c272e5f211d47a74f9204baeef/37399699221.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/wuvusebonadono.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/besixera.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ribinifasosu.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/tusasuw.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/nimuselufafijujepeti.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8i3jab2u21cbhpjuaggoc71qn4/64187240037.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/ramozorof.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa0ee8275---selopeku.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a025978906d---lowafefutefewejud.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1cc8d18ee---39248475618.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/3108057669.pdfIn PDF document text
    • https://goldenapp.net/file/tenimotavaparulimoxami.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/rodelumogotuv.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/pijufifonos.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/bipefefito.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-28/20210528231558976286.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/77415296527.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9090507b8---91303450719.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/907ffea26c67e959cbde167e840fd6da/55183923280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bus+ticket+bookingPDF 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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 10484 bytes
SHA-256: 913c2f94825f2c2b9d789d08311827c9704cc92bdea3c9124f003608b0bd9a8b
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 17424 bytes
SHA-256: 7ce8ce979cbaa3f30c4848473d24591f3a8f73bb1d740cb45ea8c891d95207ef
font_02_sfnt_off00013343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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