Malicious PDF — malware analysis report

Static analysis result for SHA-256 677fe09bdf5f872a…

MALICIOUS

PDF

93.2 KB Created: 2021-07-14 04:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98a6be26667b97ae870c84f66270055c SHA-1: 99c9b1a7920a2a2bcfce7483b89ca737faab63fe SHA-256: 677fe09bdf5f872a27a000d769ae9932a406a74492757758c4b152484f45ccad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an intent to redirect users to malicious content or phishing pages. The presence of multiple links on compromised CMS uploads and disposable hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kisorelekokarogujot.pdf In PDF document text
    • http://bjbtrh.com/files/pic/file/45380841352.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074387d7541b---22225284220.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/16617246582.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/xedutazipogifororin.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/37d2e030120ad60e139e158ab04a0530/87312650375.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/18386912206.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/91389dd9478a33e3e13b7e07870fd889/pajigeratof.pdfIn PDF document text
    • https://ferropula.hr/files/josaluliwefironowejumotel.pdfIn PDF document text
    • http://www.puhito.hu/uploads/59006768597.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kitedota.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/66617707b0c4a03b0618ecf40d3b9c5c/welobixibo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ac3a2321---38958492362.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/33103066367.pdfIn PDF document text
    • https://denimder.org/resimler/files/xelaruwotivaniko.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607914134459d---xupatarirupoju.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/v8uk78dpue3hfj9otcl6r0cqtr/nularifijeto.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/gefolozomikoduzovelako.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/nevoduligu.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/31558579942.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb2a8fc8d---nufejam.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7bc4e6a45---8284791570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=entropy+and+irreversibilityPDF 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_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 19460 bytes
SHA-256: 357db6dc8213fd3309b16ae18986fe8b29233e63b108af38c1fbce367280a6f6
font_01_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F16 10688 bytes
SHA-256: 66cd3f5a185a4aec2b6ba38f3afd3eff0766312fc91b15475f44c9b7bd850cb2

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