Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f9fc75d97e4272…

MALICIOUS

PDF

81.4 KB Created: 2021-10-16 20:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 381a71fb43e6e291a5e85b7cd3ce2240 SHA-1: b5c9ad8e30e810add9022ff93aed783460a5d5d5 SHA-256: d1f9fc75d97e427252936afc292346cb531fea301834f8f69e1656e67ca1ca0d
212 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and heuristics indicate it is designed to lure users into executing commands via their clipboard. This suggests an attempt to download and execute a second-stage payload. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c94e06ed88---97940921430.pdf In PDF document text
    • http://carmakers.cz/userfiles/files/labexofovivutudakesoreve.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/lezexolesu.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/bulatolovirunaxanozexa.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/35333908198.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386af66b41f---sijimavanubu.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/19527580899.pdfIn PDF document text
    • http://sns.hu/_user/file/tizubunonabemutafu.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/87069489658.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/tafejuwonalureluletifavo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4666c8e5a---vegesegovel.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9c3af3d75710f2bb757e31bc42445fba/29111340575.pdfIn PDF document text
    • http://short-story.ru/upload/file/goneterivovap.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/89160511883.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/63064787736.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/jekolagoridosifapowebal.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/9967174720.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/tinojosokinolape.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/vagabov.pdfIn PDF document text
    • http://honda-vo.com/upload/file/juwovixim.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/eb99d797e9172ebfd23e875d8118f981/64353527830.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/49362200810.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/5662036167.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r583cvi91hp0veceneto4lvvlm/pafenerepa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=endnote+and+scrivenerPDF 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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 10368 bytes
SHA-256: 18ba014ebea046a1ccb4612d6f53426ac0da1a0880f0f8b98db5c5584c0704e3
font_02_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 18364 bytes
SHA-256: 3a4e31a006b63ee2ed8adc56b3aa6d4bbdbf2ea423bf9cea451b132c8d803755

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