Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9249920250019aa…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 23:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ddf79af5890e0ad01891cbaacec1e2e8 SHA-1: eb891780d2e9e24385c7e205ad741c19dac82ae9 SHA-256: e9249920250019aa2b3a88c7a7abbcbe1034564a2a492bb70311d6426890c979
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings confirm the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://hytechplus.com/userfiles/file/zuxubawetanonupe.pdf In PDF document text
    • http://studiosaletta.it/userfiles/files/74838364630.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/3761666915.pdfIn PDF document text
    • http://xsteelstock.com/d/files/75156819841.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614273a234e1f---97225104107.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/28871934509.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/zesej.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/24725549040.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/64019812353.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/19415237134.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/gugadagotokijiwakufog.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/pomimemeluziroje.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/papumubuxagelati.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4961411bef2330dc6ddc5b0c8dc6297e/rusexukevoturobojup.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0hjpn6bi9nn53sad211g6g36qd/31445619699.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/95679381586.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/60758095676.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/89713883695.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/99894504062.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/ralefodemosaw.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gogirosiweruz.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/3853872516.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/57716208283.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/zujijadapetopetasex.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/29110343630.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10cba745e---14908202599.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/90170787148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=steampunk+live+wallpaper+gears+apkPDF 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_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 15992 bytes
SHA-256: cf8fc5ce16398ab15c415e9c3bca21ff4ae1e0cdd3c03ea4228ec0bf2974b198
font_01_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 10896 bytes
SHA-256: 5d9e0e9ae2fb980da0de7ecb759220d87fc814489e503adac97794f0246e226f

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