Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fda530964c38cb6…

MALICIOUS

PDF

97.5 KB Created: 2021-09-05 18:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 627d6bb16f937792862ea4d0142bd3d2 SHA-1: 750cd7ed582898069791383564a7cf6293ef4b10 SHA-256: 1fda530964c38cb63e092ac062db1180b0b914a00637af95b6c863f225f3fafb
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing software, a common tactic for phishing or malware distribution. The presence of numerous links to potentially compromised or disposable hosting sites further supports this, as these are often used to host malicious payloads or redirect users to phishing pages. No scripts were extracted, but the overall pattern points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://mwflower.com/upimagesfile///64595951467.pdf In PDF document text
    • http://rudolphalexander.com/uploads/files/86974565913.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/43246327908.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2b59e5661da7c456ea2d7d07334c46ad/sodapulo.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/50242516759.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081969651fb4---87427747126.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/3709442991.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jnraib673ggestjvmvk76mbauf/nusirek.pdfIn PDF document text
    • https://ptogel2.com/contents//files/tagoj.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/zewavumewitudokisuvawudip.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m6bv42fi1h196lndijol38q4v8/giwakopowud.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/57161636.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b7f1ecc07c6bc178aab9764c2571156c/befosasijidumoxo.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/17895254745.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/monovivuzemenevowonene.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/34539228731.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/7721007820.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/nawit.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/95739101753.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/9424270820.pdfIn PDF document text
    • https://alutat.com/data/file/23770897868.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/rozuzefexiwupi.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/nefimeruliwagiluvuvorodi.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/tibuwepabovetiduwi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b699b7b435---sisifutuso.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/3565894348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+disable+pdf+in+chromePDF 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_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 19088 bytes
SHA-256: 4530b088c146072736e84f0e3b9cd95395851cb1c2dfd9161ac7a10ad0726dc1
font_01_sfnt_off000146b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B4 11104 bytes
SHA-256: aa044d1c35a626afc9e52f847152b535c8fad1016ff73cfddb65e2a8a65ddf32
font_02_sfnt_off0001602a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1602A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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