Malicious PDF — malware analysis report

Static analysis result for SHA-256 229888d9d1499117…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 20:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca5fb2869e2d0ba7cb1f2660b0742271 SHA-1: ef38c998c6eb637d3f83a6e764d527d9226b5222 SHA-256: 229888d9d1499117533755abcdf2fe7c8d263cd0ae3cc26bb8cf9cf5d4b0ecb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=proctor+silex+bread+maker+80139+manual PDF link annotation
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/wunuvozosarefi.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210607035116.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/89292550228.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/welapemo.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a12e2b4710b---rozetugodegikesanozudapo.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/gemakijekiwonef.pdfIn PDF document text
    • https://mauspro.net/upload/files/91873573857.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f9e3585d66ee7cb83e5df3075999ca5a/74466935406.pdfIn PDF document text
    • http://tercovci.cz/files/file/52939156622.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99afe3770---81749789425.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/zunawumutifilogi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b0b5f77d2729fe2f33f72a22358a53cc/xazisogapabojufozejifabem.pdfIn PDF document text
    • http://maksimetall.ru/files/46530633658.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/lopuvilufulunufigal.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c95de8d5e2f---85916183419.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ai0rqtkilppe3rlsrvh33dkajc/81364769033.pdfIn PDF document text
    • http://hodori247.com/uploads/files/dokexelizunideratejaze.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/fetawudesisineba.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e725fa3aad---mimezegosuf.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/ketomoter.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608961c675d0e---92072132500.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a1060f1ac4758b1e4e693d1f04c54720/65405681487.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/vagusurarajazerojugupu.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/zoxoge.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6565f756767adb8bc2e1ee413d5be3cf/20383817000.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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 18500 bytes
SHA-256: c74a8aa06643981719deea2bc0abee14d1a58800c6cf447e1814d1103f9bd813
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 11688 bytes
SHA-256: bb2bba5cc3e3e805ccbc85200bb9814b7ff32a69d8d9d592408fb0fd26661155

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