Malicious PDF — malware analysis report

Static analysis result for SHA-256 55566c18c7e1aa9e…

MALICIOUS

PDF

86.0 KB Created: 2021-10-11 22:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 02c4418c70b1822d6040435186ef0cee SHA-1: f98250dc5a3f119ed0109ed0832be5ca2e9c6bd9 SHA-256: 55566c18c7e1aa9ec715ad02e2b3aefc01e407f430d6679830785b4b4d34ca42
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it uses social engineering tactics, specifically a 'ClickFix' lure, to trick the user into executing commands via the clipboard. This suggests the document is designed to bypass macro restrictions and prompt the user to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://euinsuti.ro/app/webroot/files/userfiles/files/59816616299.pdf In PDF document text
    • http://airsoft1.ro/files/file/38892311604.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/gutenawadudozop.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/setolivusapegujazadujam.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd72c55bf---39033854117.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/muwurexotesonijosobesuku.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/mukamiba.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b044b71ec2a4e9f7a209dc8d74ff047c/wunezofexowegon.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/zureperaseziruvarotijesa.pdfIn PDF document text
    • https://icbacademy.com/upload/files/76383618235.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/24746446053.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/086d03ace1f086dcf8837973a417c7ba/tiguvela.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/sukiginuxuluje.pdfIn PDF document text
    • http://sakem.org/userfiles/files/memaruw.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/17086021828.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616299fd56b4f---24065583950.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/wavefegoxegarezasaweg.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/95921780029.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/sonarifexulopuviliro.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/widafikolunazedifid.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/merebesopefilod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=dual+boot+chrome+os+and+linux+mintPDF 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_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 19396 bytes
SHA-256: facbc9d27154b6c4e6c110d0886079310fa8ea2e30cb799a6b55f997cde09d00
font_01_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13148 10976 bytes
SHA-256: a737ac9dcfa372f5c75c5fcf8ce208e37cc7ce52048f2890d2f2d9da2e619709

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