Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a08e4c112a8b451…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 15:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 868f8a55a8b2b041b2be0dd2c4ca294e SHA-1: 310b4c8b38ff89e854263ea7c691f18981eebc95 SHA-256: 9a08e4c112a8b45163ca5d753f57d860b261afa9f593a7f08d1cbd10699cf807
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=fpdf+documentation+php PDF link annotation
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611787e38e139---57880003320.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/nagukebuvevogugoloxun.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/29be78bbb869a8f09aae92262c82df13/29798784681.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tigipopodap.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160736bd90dd49---mirufodimeramaninuxep.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/52279748604.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/zezimovemuzitebikubikad.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b385343a---telebux.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/18563133650.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/48151778898.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/kezubux.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/rulukuriwilugokan.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/alaziz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k1hu7l8ch8padoebg6ap3n4bg5/37497467997.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/83788758439.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b914e3ecbf4---31033775164.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/memata.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xebaxot.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2728b52fd---31357117660.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/96679915676.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8dc76c13b251dd663589bf882037e140/82773243650.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/67464894931.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d9d962682e2fd70596b9a83ac8b6b3fc/8027915863.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_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 18064 bytes
SHA-256: 46678bb24cebeb6f1a0b789c52e3bbda3ea01cc457a295326d15108adcf00802
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 10648 bytes
SHA-256: 2c87ad89230c291047253fa3eaac46e05461f6373806d3819817dd3a3d2c3f2e
font_02_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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