Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cee83ded2c9679…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 01:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e8ce06955b9aea0b33e55ef44ba91f9 SHA-1: 5c6d5d396c69aaa265ef0a27bc70c136a032edc8 SHA-256: 54cee83ded2c967975a4649d203a6538c5d962f15996f1c66cd72a164c27b00e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://irlanc.ru/uplcv?utm_term=most+yellow+cards+in+football+match PDF link annotation
    • https://culturasiapamplona.com/guiarte_userfiles/files/17843962876.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lofore.pdfIn PDF document text
    • https://amblamy.ee/upload/file/mimij.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608eedf0b75b5---47258789886.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609018fded99b---22329440230.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc78a73ff7---jarobemovosofivix.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/41421169244.pdfIn PDF document text
    • https://bloc-immo.com/images/75576182193.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b6c87bf8fa1eaee88a438235ff4b34b4/xosofatuxasab.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/16606617920.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/jujug.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/wibibudu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/adf398e6fe08988c836cf497d13a2f0b/81398963230.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a63732213d---21933447770.pdfIn PDF document text
    • https://noddy.nu/images/file/99372383535.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/68861078650.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160907f094ac7e---luxakugolugero.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/pexuvis.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/b40t98qsh0ucseiinu6j3f9eqi/laputokivopexajegegeleri.pdfIn PDF document text
    • http://artospace.com/pics/file/numovisazu.pdfIn PDF document text
    • http://grupophi.es/uploads/files/jafetalizipawoziposurifow.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_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 17816 bytes
SHA-256: 4bf2a7003ec8f013dee7b3a320ce9c58a9f110300f18d2a8de6a3aaf764c4481
font_01_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 11076 bytes
SHA-256: a75bb2bd7acc06b9b48edc6591a941b9c17501d6bbfca8cbdeddaa476aa8c409

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