Malicious PDF — malware analysis report

Static analysis result for SHA-256 589c0eb598cff7b7…

MALICIOUS

PDF

59.8 KB Created: 2021-06-15 18:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6cfd1b2e1a3d6410f29564639c212e0 SHA-1: 72384a702c02f3fcd8a28c30eb5a7c80a80c5c25 SHA-256: 589c0eb598cff7b7d2963bf9c783a6fc13119a99a8bb28cb2ac3ea0a55e4e5e9
154 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 a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of external URIs and a link farm structure strongly suggests a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://philabc.ru/uplcv?utm_term=mature+pics+hd
    • https://kuepancong.com/contents//files/wilevifani.pdf
    • https://ivanda-commerce.hr/userfiles/file/vopamisemik.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b6f75dcbff865976fb8582fb8e31b9e5/34239224561.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecec8b8699---mupefapaluruvapidareje.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f11jbnu3tedll0pnrm22pd2u73/fovifobuv.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ef23e712b---fojokuwimojidubik.pdf
    • http://charivne.info/images/file/55052767873.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608120b2dc12c---348570222.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607448d3a921f---58971055823.pdf
    • http://almar-bus.pl/userfiles/file/wutow.pdf
    • http://progfin.pl/userfiles/file/42424598531.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07d5f6a313---zufirorevunoriroworinijuw.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089be31cb0eb---bipixojufaf.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d65114d2f---xumeguror.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a8503d86---39824920850.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c897.bin
c955c34c3f66f8c89a030c8def162ae522b8753e97bcdcdbc874d759a981d691		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 5132 bytes

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