Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9e22d89ffbdfbf…

MALICIOUS

PDF

84.4 KB Created: 2021-06-27 03:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 244e5c279a548c8f46f0d1a879aad4eb SHA-1: a7df00a7b09cf3a67c0c4640feaaf7ad30ac9dc2 SHA-256: 8e9e22d89ffbdfbf41dd8c080773890c093b5cce4345ca58b60b14f658d5547e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=find+the+lowest+common+multiple+of+24+and+36
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072630f77ae7---dorezo.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fbd8ca6deeabf42f0ebedac92c4271c3/91308008051.pdf
    • https://alamansyria.com/userfiles/file/sozigeke.pdf
    • http://naturalmis.com/userfiles/file/93094452361.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/32935324209.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3f29ba41f---1004742358.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609410cb6de10---bexanupenegafalevijar.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec2a8022a---xezowi.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1epoed03ph1c63rmcop55nhq42/62460228659.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ade01e07ed93a8c8c383858d94790d23/buwazarezutimebuj.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/cs7iqb5l3d7ld8io5psrvpnd3j/58532818891.pdf
    • http://dfh-consulting.com/userfiles/file/99251943956.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3abf4a431---44553977418.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/53e2d8414eadb96261f2de4b7e1bcea5/bedesutilibako.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/f19779b359738d89a4e6ef1ed480816d/52421740129.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a1e9ff43bb841f5bbfa5b36bf32082cd/68628704709.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2366048116---jerepalaniwose.pdf
    • http://allasclub.com/campannas/file/420308234.pdf
    • http://aytekinpolatel.com/image/files/34324213634.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607074e9e3aaa---52020909311.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3039d0b0a---fivenobasatov.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665298adcf---41267163404.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a976be60---tolopidebivedodevewap.pdf
    • http://yachtandgulet.com/userfiles/file/95984370642.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dhjgrpik7hta6lgmajvkj4k1o9/ketudaxafodovuzuxuzoken.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc96.bin
637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC96 16172 bytes
font_01_sfnt_off0000e232.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 16792 bytes
font_02_sfnt_off0000fa44.bin
1a637b5a5f8448f44529cda3795751f2451e4844a2a065f083d75319880c6b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 17468 bytes
font_03_sfnt_off00012869.bin
baf032a615285d66964e8cafffd537576af1be6e93f39cde5a392e57fed63230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 11484 bytes

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