Malicious PDF — malware analysis report

Static analysis result for SHA-256 5956a9cf3c366856…

MALICIOUS

PDF

62.3 KB Created: 2021-09-28 08:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d83bce106d90214f501ceddc4b4303c SHA-1: 10d89dd91cfb6006df5d93fd4cbbeb1b99986edd SHA-256: 5956a9cf3c366856239f9207d715edf1cc95f8b1140ecaef96416e6696fa379c
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of PDF-specific heuristics and embedded URLs strongly suggests an attempt to redirect users to malicious sites, likely as part of a phishing campaign or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5364

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=english+film+hot+film PDF link annotation
    • https://snowcat.pl/admin/ckfinder/userfiles/files/6769213779.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/87253788021.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2649d4332---nuvote.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/wuxogowonipumudemagorones.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/wemuva.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovi6uau1aor57v7jg6vggs78te/toragus.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/podulokezuna.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/pujixajexefifido.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150ece104f75---banofodo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c494daffc---degazisisupamerafoxi.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/gekibiwatu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/10636051450.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/sowuwitodedorebas.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134b88263882---56589011941.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145b0bee272d---kasuvubexuwatupotuz.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210918110546.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/28197523815.pdfIn PDF document text
    • https://virker-ikke.dk/files/98567471435.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eab943e6f---20122408714.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/55710376058.pdfIn PDF document text
    • http://www.moulbaix.be/fck/file/vukoketepara.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/pewukadebisa.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/ruritigowoberixunowufa.pdfIn PDF document text
    • https://ratodua.com/contents/files/pogizuxetaxu.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/nukiti.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E8 10248 bytes
SHA-256: 996336c6cd829a0b8c83306d5f35f56465d9c9e9b50676ae74ff439dbe9e19c8
font_01_sfnt_off0000c7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1