Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e66e48919e4d0bf…

MALICIOUS

PDF

112.4 KB Created: 2021-06-20 09:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 90a66c10e2caaa1a068d77b3944ce639 SHA-1: 160b91947570635925b5dc13ac86dc856140fffd SHA-256: 8e66e48919e4d0bf150e581a320090de5d5670832304b8ba893492bcb698e886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7841

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://laborke.ru/uplcv?utm_term=mafia+city+jewelry+card PDF link annotation
    • https://associazionedynamica.it/uploads/file/69239504302.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c05d7b7f---94157047439.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0e7b4d75804036d3414b16a7940fb8c0/20980936395.pdfIn PDF document text
    • https://nevisnews.com/userfiles/geviwanopaj.pdfIn PDF document text
    • https://invest.pl/userfiles/file/9567732151.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/612e95b3673ea3718d6a337037ecab19/woxumijovar.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/xuvenozuta.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/56457390757.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608251251072f---bomuzoginowikewamidid.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/pefedido.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e27f55fd1e---80273436709.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48286686966.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/vujaguvuvuregozokusobaj.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88d4176719---bizuw.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/52606572069.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442248a7d5---sevinuponoraxume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D96 9112 bytes
SHA-256: f86109b948b305d46818ce8336aafe6a6168a1ef3f4f91bf0cf81e8f4dd3825f
font_01_sfnt_off00016c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C15 5112 bytes
SHA-256: d22193bdb57601635f035f6683df2b5896212fb10938c4ac6d7946de0069f998
font_02_sfnt_off00017db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB0 13132 bytes
SHA-256: a868fa1ee9ed1c9b59d2a01ac8a054ac7f733338451e9f0ebd8be95ab021d4c1
font_03_sfnt_off0001a9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9A8 16192 bytes
SHA-256: 296b33a6e69ac3fa8ed420f1d1b401a0712a5a108b7c5c6efc73671719323d57

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