Malicious PDF — malware analysis report

Static analysis result for SHA-256 92571a0ff5b53c1d…

MALICIOUS

PDF

82.0 KB Created: 2021-08-04 06:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6648443afd5f9ffa670d28afcb6ea660 SHA-1: 18e2bbaf8421dcf6af3bbb3bec61044fa8520fcf SHA-256: 92571a0ff5b53c1d74a47567b5034f95728e619f92a47483cd5b49259785970f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware or lead users to phishing sites. ClamAV detected it as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8700

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h0u6079oq3u9dm10u729c79g3s/3401319346.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2bae8730---jewogaxadipimobex.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1e5152524---budenogikofavovejeniku.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/m40tg39rpariih5jgq0a2lp05n/tumajiji.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/mogovomox.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/96200916731.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10a3d7365---26168277945.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf64fcaff1---40599969645.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/57620aaf21cbe3befdc90068c2291fd1/61851799623.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/gunikilijivig.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/mudovamutiwulusumomatofu.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/wuwuxo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bujukinuwajujepexav.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/13031187518.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d591a3785da534e9fd9b72076c1556e3/80702902799.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210620044639_xjlnwl.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/kuzolesinenogapu.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/10748233341.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d8b86b35c4c405b17c39b9f2aef3d9db/77203498854.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/zenuzudupuxos.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce51677cc5---gipemovapari.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506185951293019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fisher+and+paykel+fridge+repairs+brisbane+northsidePDF 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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 17812 bytes
SHA-256: 3fd810a42bf1f0fdbc8cc2ac35e9cab9facb21a31da5e4ea12011ddab12c80fa
font_01_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 11100 bytes
SHA-256: aaa6e633b768fb6a2105cef1cacbffecfb7a78d8d87bbecac20f8278c9aea75e

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