Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd8b58808322229…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 09:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c013f825d1bc4f944cb8aa77955f7b8 SHA-1: f293b0dec7a6811f6f744096d1c07704524ad3df SHA-256: afd8b58808322229f122d95f28125fb54c419fbb7afa44cb4ac3e079cd284e8b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1219 Remote Services

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous links to external sites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm designed to host or redirect to malicious content. The document explicitly instructs the user to interact with remote support tools or paste content into command-line interfaces, indicating a social engineering attempt to gain system access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://coretry.ru/uplcv?utm_term=mirroring+pc+to+android PDF link annotation
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/30402942836.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0947f87---46243147153.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/tigisapawofifabined.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/gujonupedabebaxari.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/5550967464.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/851137986612e987aefaec.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/mawapaxixabolatulonukelo.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/rekagubigopugoba.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad746ce47c---60676137015.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/gunawajojodabefe.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d414f35d4a---kodusu.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/fuwoxenitigasutumifer.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/tanolijujuz.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/92148728393.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d702761f6---jomidapebikasoso.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/gobazuzesevedumutit.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161317c998b675---76734518306.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vnv6d3gip24e44khsed85qnmfm/83818656032.pdfIn PDF document text
    • http://fohow77.ru/upload/file/31988220755.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/48935875377.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/jalosevojagukugalupol.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/73441278203.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/28028933997.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_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10336 bytes
SHA-256: a86327316bf8bbc96264215493d9f88c2cf350ccbbb8406966794a456315f602
font_02_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 17680 bytes
SHA-256: 41120b9fb427ed1f51287ceb16f0cff646ddc0cbd10953d1b8553fda50b32823

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