Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61f9ae904543451…

MALICIOUS

PDF

109.5 KB Created: 2021-09-02 06:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71934aa39d5955ee7e087327eb4c6578 SHA-1: 79ad423d1e284daef7503a8814d58de71d10e24c SHA-256: f61f9ae90454345152d011fec0a104c5071e457181845b60a101fd2a0c597855
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://parquesanalbertohurtado.cl/ckfinder/userfiles/files/68250472765.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4e3e2cd0c---mumuramabipar.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gibijileliz.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f5a74e6e---5324513090.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/77065785368.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210822084331194425.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/35361463270.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/batebejaguguwagevupe.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce289583891---36972388702.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2skina1qfv1dli3kid0r5210d0/38993126024.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1628421134.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/wigiraramagixov.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b382a3a1c6---serezevimamadugab.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/95633233870.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756c759514b---64598828214.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/40538103105.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bhvlnq3ntfalndh69394h2sfn3/66074531552.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c25d2deca---46668851324.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/af3fd70a12a28a9715d818489ab3f4a3/93429483677.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/21aef744d9a852993cf2767a5b23513b/pedozatam.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/11516125263.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/jazivivo.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/nejodigekudap.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/vadanawixupewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=determinants+of+long+run+aggregate+supplyPDF 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_off00014648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14648 10916 bytes
SHA-256: 7defeefbfcf330d6d1ad9941252f10b611b69f7684dd0a267006b1bb8c7861a1
font_01_sfnt_off00015f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F92 18220 bytes
SHA-256: 87ec130cd338ce4585366171d6d02e1848049efe8076f8ec2eb5de194d6fe98d
font_02_sfnt_off00018f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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