Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3e87d6252cbb7b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 00:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 729367a2c32f2716819bb95ab75f1f26 SHA-1: 60108e966134b9e78b7575f8afef526765d1b3cf SHA-256: 4b3e87d6252cbb7bd99211bcb5db607720a9196e73c02fc6d8a024e90ea82d2c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm hosted on multiple domains, including compromised CMS uploads, designed to trick users into downloading further malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's intent is to prompt the user to install a browser extension or update. While no scripts were directly extracted, the nature of the link farm and the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://longchimvac.net/app/webroot/uploads/files/satumadinanaraxum.pdf In PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/mixitagezopovot.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/bemosafofabivi.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/59559442925.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/76659223169.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/79474380395.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136c583af44a---39190656862.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/45584000983.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/gemupesuserew.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/letavareluwedoxojaxe.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/24879009130.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/perununi.pdfIn PDF document text
    • http://test-immo.com/file/87115784796.pdfIn PDF document text
    • https://blugarden.eu/file/zamozeponawe.pdfIn PDF document text
    • https://medtek.vn/storage/file/xudedamidapivuj.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/lisuwime.pdfIn PDF document text
    • http://poorclarescork.ie/images/bedefilog.pdfIn PDF document text
    • https://netlandschool.cl/files/parapekatupunisatudejune.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/zavutokugikup.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/34711899574.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3lluffpsjblu1fb9dnp4cbl0es/51894086157.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136628873794---74497370745.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/8257624510.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/lovunumijawexam.pdfIn PDF document text
    • http://canadanur.com/resimler/files/bixavuvobevepa.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/rotenuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chrome+52+for+androidPDF 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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 17536 bytes
SHA-256: 7ea957f9ab2ba891f499958006f627e2eb8b6013a05999d63521434b976c9902
font_02_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 10592 bytes
SHA-256: 3daae12c75addf693e236bde981aeaea871178a809b91c7a10e28aaa6433dd29

Open this report in the interactive analyzer, or submit your own file for analysis.