Malicious PDF — malware analysis report

Static analysis result for SHA-256 2285a33062fb967f…

MALICIOUS

PDF

90.9 KB Created: 2021-09-21 16:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 453fe73f9ca75a0d4048737dcb1e128a SHA-1: 9162816a43c967329554e87883acf192ee99676f SHA-256: 2285a33062fb967fc6511a03a18a57a58c814a33db2a38d7493a3c64516a5349
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be part of a link farm hosted on compromised or disposable domains. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy/paste commands into a shell, a common technique for executing downloaded payloads. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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
  • 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://synerhu.ru/uplcv?utm_term=how+to+root+android+2020
    • http://radio-salsa.fr/php/rs/filesupload/file/fesasopiwazepamalerewo.pdf
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/jowiketumejowokasep.pdf
    • http://millecolori.it/images/file/visawegopuxefisase.pdf
    • http://flamefitnessstudio.com/cewit/images/file/mewakuduxipexapijogiz.pdf
    • http://jumpstart.mobi/userfiles/file/kanumupuzozosixoduluwuru.pdf
    • https://dentalrud.com/userfiles/file/jubusowuxagiborebi.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/12819490732.pdf
    • http://abwplazaview.com/uploads/files/62894222499.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd0328a20---sitewuzomol.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/korolepidar.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc9ea2242---2597909064.pdf
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/losigof.pdf
    • http://churchtextile.com/userfiles/file/senazapekokubelotixoso.pdf
    • http://ateliergermain.net/sites/default/files/file/wakikofoze.pdf
    • http://td-mg.ru/uploads/files/zidakupaxunawomevafi.pdf
    • http://labradory.pl/file/96378249670.pdf
    • http://haokunchem.cn/upload/files/wopozobofinosunapin.pdf
    • http://bajcsidavidfoto.com/_user/file/jererawusazozavudug.pdf
    • http://mlsy.cz/images/file/files/21770964697.pdf
    • https://clubsecurite.fr/webroot/upload/files/zakuredizu.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/kuxomopa.pdf
    • https://lazerom.pro/media/file/68662292888.pdf
    • https://greenways.at/userfiles/file/52565807946.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/11f8d8eef8b0d196bfa5bbad9c13576e/18233847111.pdf
    • http://cathugo-catamarans.de/res/wysiwyg/file/76800874485.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe3.bin
5cc233d04c0b5acd4c730d345453f960666ab86e2361fbbdd799bb59ecbdbe83
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 10212 bytes
font_01_sfnt_off000116ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 16792 bytes
font_02_sfnt_off00012eff.bin
2dd00658ec1ae4e03ff24f77c5d404efe4d41f2caf912726f08bd55132bcae7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 17952 bytes