Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8100358e6391a16…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 13:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46073a046695fd60b13eaa742e5b3115 SHA-1: bc3e9e90e5f7d8f6b15ff455f4a7f7c1feb02f2c SHA-256: e8100358e6391a165e84f09b2587c99f6e94467eda0fd8ecbcc2253e3f0564a2
176 Risk Score

Malware Insights

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

The PDF is identified as an image-based lure, typical of phishing campaigns, containing numerous links to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing analysis of specific instructions, but the presence of multiple links to external resources suggests a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/ruxadiwupufidenite.pdf In PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ed588e4cc6477b517b166aa55247ca60/80904903504.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/lukadasijudivine.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160749e5a2927f---gepewez.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/28294432032.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1ef88528b2fb45298c74a63be5a730c2/retoravorug.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1d8b7600f67b613f667f529c022dc184/rurixiwepinusetawuzokun.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/denefa.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/89374702582.pdfIn PDF document text
    • http://vtaky.sk/media/file/pekavipakewifibib.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56525597904.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/rosukoz.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/wataxubebenarodirow.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/530ffe886d13e12f9aa35b7a427a43b0/jutogowezigopo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8f84673e7c1bbee6f1d868c15c0fb691/lixaropu.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/80725267995.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210826181218.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/tutexifadufobilof.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/37979254980.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/96626981187.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/lomebizikux.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/tibamonadixeroropifal.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/mnu0dakedf02rn0cgilhauq8j2/14223449844.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c31620c20fe---32284374095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=reflexive+verb+spanish+practice+worksheetsPDF 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_off0000b323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB323 11108 bytes
SHA-256: 081c787dd219837344baf8ae9b9c70425496a6d8fe6bb5791fa3e5a62a3ef546
font_01_sfnt_off0000cce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 13796 bytes
SHA-256: 6738663bd14508ed2f6e7731ab669dfd05f7ef3ace60e25723b2a2dbeaae266a