Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb3c1732056bbfd…

MALICIOUS

PDF

107.7 KB Created: 2021-09-06 13:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9327176f06c42ed991119b48dabc09c4 SHA-1: 256a733f6bc1f7902ef74006082cccf38372db73 SHA-256: dfb3c1732056bbfda02c3cde3717e313b611c743b57170f85df798db3a5ed6f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/anj9ijqm6kgb4fjtntav398v93/zidudarikisuturiwom.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d4e9d25adee26bfe77fe6c58d21cb301/87212428513.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d578b2155a---tipus.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/libabomokafurejamate.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/39364814098.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/de61edd0dd421e9d2c9b63aac75e2ad2/fosajutebuxavuzebe.pdfIn PDF document text
    • http://poorclarescork.ie/images/jijajetuso.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/8c695431aab97360d75c9e6348e036ef/72929367079.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/u1h2064hnqieqeb5mhmhv9a5u2/bowudodaziwawogonodopogi.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/29404622241.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lamiralapaxuvojip.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/zizowumekogivupuneveko.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92408226ed---79195351551.pdfIn PDF document text
    • http://plncse.hu/php_data/file/fuwutuwugexepikenozi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d2dfd46c9---4039725962.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210706033558.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/087cec72d7b11ccce0a2b1d86d1d95d3/26794729152.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021815116399562.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xileripikaxuninedurunuxaz.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/35965466301.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/45i30bi17okrvq9e9fmfo52au4/buvawopagapevunududom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=aflatoxin+in+food+pdfPDF 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_off00013e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 19636 bytes
SHA-256: b159071c44c3fbb0431049890dc4b93c3755efbb983df8bc87d5a75ea79a52bd
font_01_sfnt_off0001721a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721A 10172 bytes
SHA-256: 74dfef9e3b9f2f7c3e66b057c11b21c99ce3069da48afb6a7113a2ccec9508ab
font_02_sfnt_off000188f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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