Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8b6b982aeee974…

MALICIOUS

PDF

92.2 KB Created: 2021-09-06 09:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5905135bd5cf66c1ab9cdf83f4db9d6b SHA-1: 1ce1e308240e411391fb05a8430e2b3633fc70af SHA-256: 0a8b6b982aeee974fd0253d46cb30b7a854f5f62c0d032111c67934106c8fa84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://synerhu.ru/uplcv?utm_term=2013+chevrolet+sonic+owner%27s+manual PDF link annotation
    • http://voszveszprem.hu/_user/file/60138984071.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/lixanetolijazegafu.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/lifexubumiwo.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/badupugobop.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/46474208a501a6a155c70b888189ae69/lakobewowagarusexuwizod.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e5a9e11362a1f8637a72bb0c643c0ead/35491050146.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5995acbba3---juzofupiminageli.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batikumuzuxiluse.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ee1c0432a1e2497fed23f4c99c773b7a/80059146134.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/nld7c0ae9qg60ogpslqrsaha45/49439974888.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/kafejokidoj.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/96301485269.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e96bdf33.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070806161087.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/52761935231.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5f8ca831---30788842909.pdfIn PDF document text
    • https://rjpexport.com/files/bebadika.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcd75a72d---giledobuvobefijaxejalani.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/46517454332.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/fofewenodimosowim.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec5558abd9---36372640575.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/50715672311.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/gasutajus.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0e22a38693ab9aa50dbcae83486cccb4/vevok.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_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 20060 bytes
SHA-256: a5d7154a266b60654ba976c48c720a88748a3ba26b1b6b5ebafebf1093329751
font_01_sfnt_off00013087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001489e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489E 11152 bytes
SHA-256: ad83c1aecf575c538b70f201e2ee71bf7cda07bef9322223609fd547a5184f0a

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