Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b8f939df939e52…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 06:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9321a6094c37f14360985cdc76696ea SHA-1: 2baef98a747a9a89da2ff9b6f509335f8bc24930 SHA-256: c4b8f939df939e524b9668a3fced86df5df6d980307e0d9a6f1230d137fe57a4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites likely host further malicious content or phishing lures, suggesting the PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gpf9mac1ipqqitqh4f15ald8l5/kumakuzisudujiju.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3063b12bb3---53117258632.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074b0d45262d---janexakemiruf.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80aff4c3b2---33049679329.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/791847cf5952579f3b0a0c6f8ab349a1/wekoza.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/tulimigusa.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/difuboxevubufoma.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/64985022167.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/16284462089.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78ddb69e4---78294648857.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073589a3a28f---zurijubugabatenakepof.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/gamojapitubibapolonu.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/sopanuni.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2lpr4d81fsoonqgrjkf9jpmr2b/dibisizu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa080c3b317---54392539626.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/72d592e74ded0ed0f8e2e64c29dbffd8/44736259264.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/28337680585.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad000d88fdf---mevimexegezikazumidaso.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/tedasudami.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/kelonod.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/wijolanugapas.pdfIn PDF document text
    • http://msiutilities.biz/documents/97859925053.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/88719341702.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732b0ebcd12---sukejo.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/11673385306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=span+of+managementPDF 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_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 15936 bytes
SHA-256: 0c56e64729b5c9460fe8a5d99870497589838462dd114d992e1a9b45dd3c1e8e
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 10372 bytes
SHA-256: 9ec52d1952df2c2e888a3f20c3f9ee8df0cf0685ab91a688f90d7ab95d19b8ca

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