Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca8c1cc6bece6a3…

MALICIOUS

PDF

105.2 KB Created: 2021-08-15 13:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 35e23e1957dec323735769ede6721632 SHA-1: 08a7be62cc13e0708ced5ebb99cf2e66cb24ac49 SHA-256: eca8c1cc6bece6a31c69089d25037f675f1fca93a1c2367a7a838fe1826ecafc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as malicious, likely a phishing or malware distribution attempt. The presence of multiple PDF link farm heuristics and external URI firings strongly suggests this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://queure.ru/uplcv?utm_term=bhajan+lyrics+gujarati+pdf PDF link annotation
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/999dda9cdfa0d69abdaf8a64bbda7119/97761281303.pdfIn PDF document text
    • http://bulmarconsult.com/files/kofotedetozumujiv.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8gh2gl2ef88pivh0h0q2vl2vvu/62455457826.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/43721301977.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbcdc1862e920fce9b8cb7cb424e57a6/kopedenoge.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/kumozuzefidofemefaje.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/74621214426.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e53b7c2d2---xijewolemob.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160826d5ca6e3a---17049923799.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160995fea9575d---37506122777.pdfIn PDF document text
    • https://sanidom.pl/img/file/fobuxatafalejurebane.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/kojomesu.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/runeleradexaropefage.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/4837809929.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/69229472344.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/v8ocvt7vurc63a3f5f13t7svo5/175953296.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaac8b6c1f---fivovezekefali.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/lkudnadb3qnvob7ftado6jj7du/18273212585.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/74366022102.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4c256a574f5a47725d1c70d06fe413fa/daresosatilafusure.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/30419620839.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/nivigud.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/59582647768.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609485c8633ac---mafijepap.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/21938410104.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/90718694307.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_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 17452 bytes
SHA-256: ce571051759b201de65ade68b50dbe099142c4b892ecc5743d572a5e5204c456
font_01_sfnt_off000161d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D1 11044 bytes
SHA-256: c62452762a74a5f2f3e682bf7412c25c9296d8e3f5a5ce85f8c64c84b2ab091b
font_02_sfnt_off00017b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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