Malicious PDF — malware analysis report

Static analysis result for SHA-256 494d3f13646556cb…

MALICIOUS

PDF

83.7 KB Created: 2021-08-18 07:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fa5f577a9c8a6855d33db8bea537413 SHA-1: 899f3b39c62c63c8fddb0e1cfd27cd1a0ec0b7ce SHA-256: 494d3f13646556cbe9ffa63022ec670a285e8b6f326b093d4e48c79ef1f522a4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. The document also hosts numerous links to other PDF files, many of which appear to be on compromised or disposable hosting, suggesting a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://luijkzonwering.nl/image/file/20783650204.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160964ef449677---35012902259.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/34986692063.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1d1a296b3955245f93143ab59076d572/nedekewuvogebirij.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/samodulimudizesitajuxola.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086eae09d5dd---70327136230.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/r8od7bbm8iu92f3p38bffqa8b6/69381971182.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/172a008b103fee158c963e62b19dd7f4/valinaxilido.pdfIn PDF document text
    • http://mobilenmr.com/files/files/72236450342.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4b90afeb1---tomesokubederul.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/nezujuripolewezatawezu.pdfIn PDF document text
    • https://inncredel.com/uploads/37180058954.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/62797d9956070c0925a03e88a6f8f671/bukerefoduposuzorikusez.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c5647cd73c4---87687617378.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/midumunubigip.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/3556272544.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/802o10r5isukebql8slrgsu9s9/jinuwazokitisibasapozetu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107d8b710587---86651764627.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca6e6f2a5---bavotijogefulenev.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/28429137694.pdfIn PDF document text
    • https://eternalbliss.net/file/35199853270.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/aa2092ae8497436deac9c4bb7d8d6697/raruseguzoj.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83b13d6127---bisoxakodixebovidowiwela.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/mumafus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab84e80e32---fitatolotesobizovif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+install+apple+tv+beta+profilePDF 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_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 10632 bytes
SHA-256: 81233ff2a7ac5c7c51420fb9ccd9ec1e96b9c028a137d561bc0ee902bb6540e0
font_02_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 17440 bytes
SHA-256: 2787cad5d43f143d35125c1a744aad8ae897b9ab506b7e5f359f797c212ef07a

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