Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc586ef86fccd1a7…

MALICIOUS

PDF

62.5 KB Created: 2021-06-29 18:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b858fd87d5c5fe7ad00c15dd10a7fb17 SHA-1: a64c3cec909c7bd206cf9c577ae5fbd065fffd2f SHA-256: fc586ef86fccd1a7588cfd07267a01f3f407b717c028095a16a598ad6492a6bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to host further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9164

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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/krtj2babgpidmau7rsd7sufd51/14272881321.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/iv69oem5afksul6n7die9see7s/17727641515.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160affec50cc41---punutam.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/xupijefa.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/48783071565.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afdee6e7f0e---53294514786.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081325e727d5---dutur.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3eba01240---nuvagibo.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/sopijajobi.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/89dd403c2d67078e4e3ec48bac6041c3/mapozufenegabomuguxukop.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7a80c8ec1---xoxanigelet.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1f6cd25d7---badixidivulinowobapefuta.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/47105557505.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/jutasutexipimoj.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0b4104a31feebbb8dee36a259bbf7bd1/wupifuxo.pdfIn PDF document text
    • http://haai.org/upload/file/resipawulafet.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/20096160346.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0e87b009f10475f00dac368e28fd13fa/95290791016.pdfIn PDF document text
    • https://schmitz.cz/res/file/vikijodore.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ea4e356b22200de7631817ca321ddb5c/xapogagek.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/55nr9f0livvksft8jsnpmsn703/jubaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=functional+assessment+tests+for+physical+therapyPDF link annotation
    • 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_off0000ca0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 10936 bytes
SHA-256: 65edef77f6f27dc25625e8dc07d2b7305476d281526271b2b983b7ea2ff51d4e
font_01_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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