Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15f9e4dd539dc88…

MALICIOUS

PDF

97.9 KB Created: 2021-08-25 17:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a397c6e3fbaaceaa61f03af7ce7b0898 SHA-1: 30e139dc91ba3b3e32fbeb7c25150399acc10767 SHA-256: d15f9e4dd539dc888a2162384b78e1a8b421388f5638506c77382ab9815a029d
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8088

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=did+you+hear+about+the+antelope+who+was+getting+dressed+when+he+was+trampled+by+a+herd+of+buffalo PDF link annotation
    • http://jevades.com/aircraft/fckimages/file/xufitusop.pdfIn PDF document text
    • https://theurbanthinktank.com/files/54620901795.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/wukanodazisevasokutowate.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/15b1b4ea6533d15509e7816fa5efe4a7/26590150007.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/86497502757.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/muwumasaxumetiduxelala.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe8b3826e3---69793316354.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nq43eq3g70bidc6g3obv0ucjk7/xijudenexubajiseb.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/kibajalagasibi.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/damekonanubufowiliv.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/wekarupoporotoxig.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16a463e215cd3d091f8bcec439a59548/mesasivutikup.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/diditafatademitilawisedu.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/41901394763.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607911496fa6a---dukijajaberobomilijes.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/583077b0dfa16729aca290d619b260ed/josefuwodak.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/3593211923.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/76667284372.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1a371f47a---vuvuvupulumiwubigonirala.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7e5bcccd---41148876854.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/kinuwilivuwebokesona.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed4986701---rumubopifidajerasedako.pdfIn PDF document text
    • http://net-marketing.hu/images/files/37960035884.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/k1kb8hdfnq7768iuqj9vu5hg83/rojusaxerudixusekit.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_off00015fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBC 11388 bytes
SHA-256: 804840c49e1b291d73706de4d615ecc909b1e60024e01f353eaa1767ee12d0d1

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