Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c657d02f33e8fe…

MALICIOUS

PDF

99.8 KB Created: 2021-09-07 17:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5417030ffdc4d7c674396a68fa42514 SHA-1: 113eed434d21c7214fd33c86640f1d0f3599b632 SHA-256: 74c657d02f33e8fee449c6a22368591a37c656a98a35d156b795200b296c7359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tannhatviet.vn/upload/files/49552749345.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/50566e0f8720790b68ee141459ad4d0d/8547146446.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/17071276657.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d7bc527dc05282fa1cc2f5afe2e16eee/49892179741.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612602a8b811d---fuxiduwoxagemu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9bd617f6---rututasaxajetagumi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35915f78e---54323321982.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/towadonanuzavopi.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/webuvujezowuzo.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210707_471230766C6C7CE4.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b6ossetu3bo2bat3e9d4f9ctfg/wafew.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be718085162---44639407843.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1ok01tb3jd0q6cdkn32e9t1klt/wixokobamakamapidapaka.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892c5c062ae---36369571852.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4ed035bc87c7508aa08b40e7c67f78cf/kevajamabixirivetak.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/29608988417.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b433c7e7b8a13771a66295942af0d027/xugivumoda.pdfIn PDF document text
    • https://drsaman.com/files/pijeritadejilanove.pdfIn PDF document text
    • https://angem.fr/userfiles/file/92005583307.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/68460629479.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160991dd46b1c8---xapedevuvin.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0ac14f29---sapuzavusidafog.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/zopirilokuganefol.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac304b7280a---65378606673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=teoria+geral+da+administra%C3%A7%C3%A3o+chiavenato+pdf+downloadPDF 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_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 19200 bytes
SHA-256: 592963d71bf71886dde687defcfc16901d79dec971ff7006c9bf5c7aee7b927b
font_01_sfnt_off00014b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2A 11644 bytes
SHA-256: 3638ae05070ff554c8cefa558447a08bb00c71c5b0fbd6b6aa51be2d0e890a84
font_02_sfnt_off000165d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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