Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f1435fa247afde…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 00:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 126ea7706b5fa5a306f42e2e93882fca SHA-1: 9afbe79ae917b56dec2249a05569d694751c54a9 SHA-256: 92f1435fa247afde63e3d3dc9cbf81cdfb484856d0cc953dc38cbc2b34d5d5c4
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple links to external PDF files, many hosted on compromised WordPress sites. The 'Browser extension / update installation lure' heuristic indicates the document's content is designed to trick users into installing malicious software. The embedded JavaScript likely facilitates the execution of further malicious code or redirects the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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 http://www.tamtrebinhminh.com/public/files/56107154759.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e75099c7cb---jizade.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021053022535380554.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/49420566246.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/88089017089.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/18586465878.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a02ac2ce4d1c66b3b67bfd5173f9879f/lasosoluxedeniku.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/vedemopozasinomivuv.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119a53bea0a3---10591998722.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/73270308693.pdfIn PDF document text
    • http://vce34.ru/attachments/file/30755296369.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fb7c6079dab98bd5179533fe5ee48ad4/tazovakirufojabagibusewi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f14a9889b---fipukepedavupakexovizuw.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dhqfjgts9u4jnchouiu86a5jd7/92218074924.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2a0f4f79811cf5632e19c2739297a91b/85309194800.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/31048572276.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/xakodititiger.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/waditetasapoduxegusomezuj.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/618fd5cae19c025fe206980d8edefc9b/zopolezedewulaw.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/86292836748.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/12390807473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gemcom+gems+tutorial+pdfPDF 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_off0000c10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10F 11000 bytes
SHA-256: 5c4194a888eb7d31d9fee18ffa48ae9048b0cd5dc1632878ea95d173439deb15
font_01_sfnt_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 16420 bytes
SHA-256: c7d80614291920558332cbd6e79369d1a974044b0aa3376078adc60405654d81

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