Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c096ea6bc4b9e4d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 19:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a551825177910aef81ca8f2834588731 SHA-1: be3984d45b0e7ccc2746bdd6aa56bb0ca2158677 SHA-256: 5c096ea6bc4b9e4d5241e8bdd09885978901712604d6ee50ff9875d03655343c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised infrastructure suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://garglob.ru/uplcv?utm_term=sbi+bank+mobile+number+change+form+pdf PDF link annotation
    • http://filippodelvita.com/demo/userfiles/file/fofejumuwel.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/juvijodukukimi.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/jusawimexifano.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/92552151094.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/segufajozebaxenap.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f0bba200b---38009546601.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/62679657579.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/94490290826.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ae2d837f9e727ed027684653caf6a921/7112445612.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6a9e60b08e206d333b17eec3d0f2cc0a/77439604157.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mepajil.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/padowikuzuwe.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/lisomagituxoxubelogibum.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4bj2njsdrhmuq9f7q0ngjovbmv/tasizumiboxaxevepovexipex.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/dd4b27f2a55731c9dd602727131d25c9/wunimuvebotuguloxesarerum.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/ropalatalafivoxakakose.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a000fbe7940---47618903324.pdfIn PDF document text
    • http://sgpeo.pl/users//file/tumebeviduvugo.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/wotetafevadesuxulaxatixo.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/43542833586.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/67232981735.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/wonunizesexuvuwolifurej.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_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 11208 bytes
SHA-256: f0804b6a81080d9c87d40f03c65b8e8cf568ae56bd913895a48b1fc1da85ff64
font_02_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 18512 bytes
SHA-256: 22f66cf233597d5d8d154364e78a157f2381dffd6d206dd8beb3e496f41d3ec7

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