Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f23532fbac9d48b…

MALICIOUS

PDF

55.3 KB Created: 2021-10-03 02:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4434972249ca3eb6886a1b61c8aebf34 SHA-1: 9d8074c9954b144d0f74be808c96ac5ad3e9311c SHA-256: 8f23532fbac9d48b396cf974608f08d010841e09cca7d186f9eed3ef6d293ab9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8789

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://allytemp.ru/uplcv?utm_term=collocations+sound+right+to+native+english+speakers+because+they PDF link annotation
    • http://digilit.ir/basefile/digilitir/files/53226914928.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614942f14d856---70136711966.pdfIn PDF document text
    • http://divelife.kz/files/file/javifawuduperikopavu.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/6972375325.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/pafokataxem.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/muvamijoleniwitamek.pdfIn PDF document text
    • http://deforma.it/userfiles/files/pozavemexi.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/13345567365.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/vifutupobitiporunazep.pdfIn PDF document text
    • http://artepcb.com/upload/files/pajopepadabexemekopela.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/244187d978edaefb1069a84bdff3d07f/79852650970.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/buwavobozijerimikomi.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/80363154250.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/sizosirer.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/dukavazitib.pdfIn PDF document text
    • https://campermagazine.tv/public/file/bapoja.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/28464576646.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/letanijojefiraja.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/17068700739.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161527a6cbe3ec---96619548722.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614036803d73a---87980738855.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/20668915461.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00F 14612 bytes
SHA-256: d68d69b9133c39b8dc14e7909329ec243bf6e241394bea3acd8ff70744537f48

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