Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac6f2ccf08c11f6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 15:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2c28940ee4446bb292d51d1fcee5451 SHA-1: e718f37e9119dc47515966cf0556cb6d8896bd85 SHA-256: 9ac6f2ccf08c11f637606a4c8d782757437ca614a2747ded3c873167ed721f01
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and trojan delivery mechanism. It employs social engineering tactics by luring users to install browser updates or extensions, and further instructs them to use clipboard commands to execute potentially malicious payloads. The embedded URLs point to various compromised websites and link farms, suggesting a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://smidgel.ru/uplcv?utm_term=adobe+pdf+reader+ubuntu PDF link annotation
    • http://baaningdoi.com/file_media/file_image/file/bojewugepuxepumalidej.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/16903026995.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/48541530271.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/jajosuvemev.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/rumefif.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/nezilizatavekavifitok.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/4ebd008fffc0505d7040e30f9e6795d6/lurirabonawujebalokixo.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-22/images/files/garegomugejurobovugedalu.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/36759918255.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf8481dc1---10382837293.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243df672f8---11471133186.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a34bd21f2---bexaxejibotojufanolo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ngs35fipach8q7gu3oq6v5ls64/kebazenug.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/93580ce88bbff11375333f9b146c93f0/wisodoxivomepod.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/71688677568.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/27613047882.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611aab327f98a---tunumatafesugam.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/97546125216.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/62550c7c03239bffd3b23a60013ae07b/99518669053.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/23996731036.pdfIn PDF document text
    • http://dzbnf.com/upload/file///vukexekugurujuzolazoluga.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a423d80b16---5544311187.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c755cc2b---5626538486.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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 10408 bytes
SHA-256: d0c19d03bbdb1f26a6695dc3526094df17903601ec3cdcdf9af2e9530dfc8e00
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 18232 bytes
SHA-256: b3c13abd72ed05a6c1509d58caaa793ab08ecd2eca0f86fe4551648f8cf50eef

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