Malicious PDF — malware analysis report

Static analysis result for SHA-256 9430cc709f1232b2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 05:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1565062071e719e6a42e38449729b062 SHA-1: ac251850416136d2ef625cae39fdb4358212dc98 SHA-256: 9430cc709f1232b2ba02edc72fe8fddad00e1a11e07e7bdfbed58a7e1c27cf40
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common tactic for downloading and executing further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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://bartonsteel.com/tony/barton/ckfinder/userfiles/files/34016710854.pdf In PDF document text
    • https://indiantalentjunction.com/milan/media/sasekibaxisofe.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/16997838518.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/80937315551.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/85573743698.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/30787233464.pdfIn PDF document text
    • https://soechi.id/userfiles/file/jagurimigutama.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/xukofadoredirizuwokurep.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630930419.pdfIn PDF document text
    • http://machulski.com/public/file/34052102913.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/47983426988.pdfIn PDF document text
    • https://seger.cz/userfiles/file/88426681453.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/zorutufadem.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/65878377023.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/febunirage.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bc5a7b56bb5105e156eb28134698fa5/44555042593.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa0e2d64ae4464a4132fdc7d6e03f652/58148938999.pdfIn PDF document text
    • http://only-svet.ru/upload/files/xiwomapijezaxazusikujafa.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/sazes.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367aa23a47a---fovesudexul.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/1945325465.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/46039869970.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/1991572773.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/jagelofefagonalup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=file+manager+for+pcPDF 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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 18132 bytes
SHA-256: 9378683af968469fe987fe5e0ac2546fe05cc13d20d39b58993f8aa783bf4f46
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 10532 bytes
SHA-256: d9b5999e7ea644745d3982d480c443a010250e750b9b32f03bb0995a1eeecd0b

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