Malicious PDF — malware analysis report

Static analysis result for SHA-256 25667e8d728d85fe…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 13:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f494cd650e9b646459f11fa7e0758289 SHA-1: 20d9fd06800ad68378bae4cde66b10c0595a4525 SHA-256: 25667e8d728d85fe64b3aa87f33776f11c73dfa500140c254d52888b026c0e7c
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It employs a social engineering tactic by presenting a lure to install a browser extension or update, a common method for distributing malware or stealing credentials. The document contains numerous links to potentially compromised websites and disposable hosting, suggesting it is part of a link farm designed to obscure the ultimate malicious destination. No scripts were extracted, but the presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://zaindu.drogomedia.com/files/galeria/files/naxarix.pdf In PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/fobogobivapapanajug.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210908081941.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144145149a12---50800742875.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/84420830663.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///pamanevijumadibaziwovo.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53089674079.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/lapopofogarog.pdfIn PDF document text
    • http://zubrcup.by/files/files/fabetawireve.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/066957993ebbb3bdc29f7c6da8a943a2/34907158626.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/pewutunegan.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/94167218470.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xaxep.pdfIn PDF document text
    • https://htchninc.com/d/files/sebobozibuzekav.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/odnqfd8lqssl1cj84nm6tsjkto/87273126803.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140d54ed2474---67250373712.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/rivedipipavuwera.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312360967a4---berivadeka.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/31383716579.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/77659111761.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/72964969167.pdfIn PDF document text
    • http://sivam.pl/files/file/womaribafeperigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=agario+bots+downloadPDF 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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 10496 bytes
SHA-256: 21e78113d77204cee46eba11fdc39be6170b4adcdb8b97f152be7240375033d6
font_01_sfnt_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 17384 bytes
SHA-256: 03c7efe7ed2a52499cdae31eacf0decf5f9cce57c105f20d5f48cd5a25e184ca

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