Malicious PDF — malware analysis report

Static analysis result for SHA-256 b408f2d64056375e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-28 01:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c35545abba5687e5d9fe6651fc1234b2 SHA-1: c3fb6fcc5b89e669e67ca74f5b832cc8fe5da23f SHA-256: b408f2d64056375eb923a6611801f19521bf9cbcd1ca61e52fa60f71bf0afb50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The embedded JavaScript stream, though not fully analyzed for specific actions, is a common vector for malicious PDF exploitation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links, likely for phishing or malware distribution, and the 'ML_NYX_PDF_MALICIOUS' score further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=community+health+nursing+2+pv+book+pdf PDF link annotation
    • https://hophamthaibinh.com/upload/files/6167682361.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/62190883512.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/tapazono.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/34700306587.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/dinetabebugupiwanitagesu.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/pesaremow.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140227fea3e0---23503870720.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/80811412095.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/18922699785.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/repupurenur.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614299c913731---9676335194.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/jefakanuwewizalapuzefig.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/wisow.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/duditafesavutiredizegox.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/gejelosigosimevid.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/lumagilasewobitopegiv.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea9cc51f4---28819855762.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/vuziziniduwowiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e42c508b93---kozevosos.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614084616c30f---rugolaba.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_off0000b6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D8 11608 bytes
SHA-256: 6955664ee4ca665290e56b4b85afdb491418a3d79672aafa508883218272f9c2
font_01_sfnt_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 19320 bytes
SHA-256: b2a88dfa31f16f4fec5d8a644661c4480908a00299c260302d30625aa5c1d897

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