Malicious PDF — malware analysis report

Static analysis result for SHA-256 4653615947862e64…

MALICIOUS

PDF

101.6 KB Created: 2021-06-15 18:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d94cc4886bbc0135aecb6e04e68027d SHA-1: 52b1964cb18d66b5c68db4173ebb8848e075fc10 SHA-256: 4653615947862e64a95f1d28bf1b396b624a1ed54d1bd90f79ddf84c42628e85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of URLs and the heuristic firings indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=assessment+for+learning+tamil+pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35c7343be---wenuwuguzutelasojimi.pdf
    • http://udmvdpo.ru/images/files/78832820628.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa0b4b22c---mozun.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e1703be75---gituzisedizupuwatuwi.pdf
    • https://angkorphotographyguide.com/userfiles/file/21865995814.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160802895bbb94---xurunazovadapijowu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a253d022f---67097522643.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/da72f26869c5e6070558f70a6c192199/47677998238.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087317696efb---zagipagofujexawilapuzet.pdf
    • http://100gastro.cz/soubory/files/29379554967.pdf
    • http://rheumatology.instituteupload/content/file/65126043497.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/69c82864d4876874dafd14efbb986da1/72273845985.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e61d65410---37808776149.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751c0c0e39---95667917122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001508c.bin
161e25e60bdfa6b1bd5d7390c3ef89a23c1d800a8f03781ec965bebb577922de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1508C 5348 bytes
font_01_sfnt_off000162a5.bin
7781d0d7f3ea2537ac364b4999896c54592cf358ccced6486f250ccdcb2f7012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162A5 11680 bytes

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