Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec3efe2a3686264…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 10:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7857bfdbb0d7ce46bd32a248b946bd1 SHA-1: 5eea30bf9538bcfd0aba881c63d12c92312fc456 SHA-256: 8ec3efe2a3686264459c060d60a77de3aa24bda2a41a16db06e880bda23e0a36
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://irlanc.ru/uplcv?utm_term=cytologie+pathologique+pdf PDF link annotation
    • http://technoculture.cz/admin/upload/file/pobaz.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf8dd204d---31041929830.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/33883727283.pdfIn PDF document text
    • http://vaynhe.com/upload/files/18527667747.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/girovefewopaba.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091311d09e4e---66665795967.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/wevakuvodidexaxoxiwe.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/muratililazelozazodejizu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c7a331e09f149c01705b96c1663eeca2/55426624043.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/97385956044.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/42987457150.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c730e415424.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/bipunokaletakanujubijigo.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/pezojaxo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df905abafbf---jiruxumilogoxakewa.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/natosawujobazilo.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/zisetivowo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c859955da6---37767797341.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/lidatojeset.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/33921214043.pdfIn PDF document text
    • http://ubest.ru/images/file/bukufeperigedi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109d43a98575---9428040386.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f367bfd14---lexerelu.pdfIn PDF document text
    • https://luminex.pl/upload/file/kofewarerisidubalonej.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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 16176 bytes
SHA-256: 5804d06b62580ac8fcc1f2ac860ac930d1c682b64af66fd0618890c9b3a09871
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 20788 bytes
SHA-256: 29ad4f9de1f80b3783778f5df8aa699c124dd3ebcd2f78607fa5317ec03826c0
font_02_sfnt_off00013845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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