Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce19355437a5a92…

MALICIOUS

PDF

79.6 KB Created: 2021-08-26 23:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d4822b6686faa4d3ba1e95618b87a3d SHA-1: 7a70444f185b588befb89d189c68be01fddae43b SHA-256: dce19355437a5a920024af9796d6856cfa8b66779bf55923f5cc8ae8bc7075c9
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. The 'Fake CAPTCHA' heuristic suggests the document aims to deceive the user into performing an action, likely to download a second-stage payload. The numerous external URLs, many pointing to compromised CMS uploads, indicate a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://garglob.ru/uplcv?utm_term=how+to+play+music+in+discord+call PDF link annotation
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2886475d5---gomogejanunex.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/m9bg6u91po7c2ieqsog16vdjet/34441779881.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/gopomizapilotuki.pdfIn PDF document text
    • https://tepihtrava.rs//files/61504591349.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/74793961136.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/89290443170.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/fepaseruselawokijinufaf.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0d2c2379---sulozawarokuxaf.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/pidalewite.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9dda2078541ac5d7017b61b9310c87c5/tadolufekajusafisimejinew.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2a41d669---77295413086.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/22795534292.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607928793b405---davofirejox.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/vuvivi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/40209c9460a6d3d21022cbc09a3c884c/tovuzegalexikixisunu.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/14003560748.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/tevesalidufixabolarebisax.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3e89098db---40561600287.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/17918257355.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/figaler.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/70146514561.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/52682722796.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4nee4navm4irdrsooar7dgir12/53445043958.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210719104404.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d09e0d4b---68892451606.pdfIn PDF document text
    • http://npas.ru/pic/file/timisuxolizadeluzagedam.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_off0000d39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 16816 bytes
SHA-256: 0a368bb25853b34c18b8c0580ac4262d976cf339f33d1cb5f836b042b53f067e
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 10836 bytes
SHA-256: 53abc3b58dff5479e38526c8ea0359d6736be65ca1975ee2f0af8f8969cf41be
font_02_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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