Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8adca2753dc179…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 05:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78cca336a65ab0072c37b472e2737b5a SHA-1: 7f3cafc7dedf0eb1ef83e1dc09c9baa60be98462 SHA-256: 5e8adca2753dc179adba8be322caa8fe147adf88f8075d9172819d128c8aebd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and its nature as a link farm suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://educasters.co/ckfinder/userfiles/files/57365462298.pdf In PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/27882289984.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d6818602b601efb81fa898b32a5d5036/veselenozazigivefu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0548a7dee---revitixadupizanapelominu.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/00801686a228e1d094d2d0f8fed4426f/xojijivuku.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f6dc0f5c---7968217840.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/94596161537.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/51296855169.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/pimowaw.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0c640c2564708d48d52e7465f94c8d64/75848757231.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/20953175903.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/fadofabowuj.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/97714614697.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/15c21ca7c5ce57077a0ad1a83f4bcc42/24677370465.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6cqlsq6go1so8gbokn3col9di0/9185752629.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/50grjg4sm6mrhh2jm4aa3atfrv/66126147733.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9dd6e35432bd231e58f2cef5880cfd06/giwarud.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c7225e95bea723e009a26e0f31a0e0b9/28395308585.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/26774222961.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/338a7320bbc3ad821fc553088faa0105/subisunofawagidedetiwe.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/95898766886.pdfIn PDF document text
    • https://zold-kommando.hu/files/75574990754.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5187200927a879f67ec4d9b9b6285628/90658761233.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/c4f20sl9bcqktclffpig2d1cco/babuzakivaxexut.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/jekusaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ardsnet+predicted+body+weight+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_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 11012 bytes
SHA-256: 9c035bc6f420eddb791d07b0e6644660046c25564e0da686d136ea479ee5ebc9
font_02_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 18056 bytes
SHA-256: 8a99dabac4aa751467fab097973cbb500d6c7ef1cbda9b4c5604b914806a721b

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