Malicious PDF — malware analysis report

Static analysis result for SHA-256 4766eee2dae1dd8a…

MALICIOUS

PDF

89.0 KB Created: 2021-09-17 06:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6be5ca6f1b23d288fe0293c64b53a996 SHA-1: 16e1fb13ffa30c8a3d2f2e9a0f88661a36ec955f SHA-256: 4766eee2dae1dd8ac1c56b17fca41d8701649e0bb6e018cc53aee0cfdebbbdae
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits malicious characteristics, including embedded JavaScript and a link farm pointing to potentially compromised hosting. The critical heuristics indicate a lure for recovery secrets or private keys, often used in conjunction with password-protected archives to bypass security gateways. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall phishing and credential harvesting objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://1666-3668.com/attach/userfiles/file/97323385430.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137698518515---gasiwofutepox.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///jesuneboboganafatijima.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/45707625231.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/75427059791.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/debavosawonosuzopazero.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/17956833834.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/dupuxemazudigibadaz.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/69768274733.pdfIn PDF document text
    • https://angkalaris.com/contents/files/69384953203.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351990f41a6---jabonurunanusijolexazew.pdfIn PDF document text
    • http://cx-gl.hu/images/files/82514685860.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jugize.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/61839273705.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/wofokozozejibir.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/taxunoxigajomavevi.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/51435743702.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/52205671500.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/mopevel.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48ec99e48---vuxesadulujupe.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/21426021758.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/7955142910.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/23345886592.pdfIn PDF document text
    • http://espwireless.net/uploads/file/zokitexudexuxofirenefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=new+super+mario+bros+2+3ds+rom+free+downloadPDF 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_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 11156 bytes
SHA-256: b6db04750b309d53ddcd4461468f637c0dade3df52f970445abd796172ac659f
font_01_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 18220 bytes
SHA-256: 2cf4c3be5eeb9a6897dec49084e4f74ce97e13db0b8618b256bfb89c6aec1199
font_02_sfnt_off00013dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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