Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b31931a1a25fa69…

MALICIOUS

PDF

144.2 KB Created: 2021-08-26 04:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5ec81b9f98b81cc0e13c099739027be SHA-1: 8b708fefe127bdfe7928112867eff8016151ae3e SHA-256: 8b31931a1a25fa69c3cddcda1b9a90e0228207cc788ad894c9c3c326b735f79d
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the structure suggests a link farm designed for SEO poisoning or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8212

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c7bb87108---96732099203.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/3831946953.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921bd392026---72716370418.pdf
    • https://alakharia.com/public_html/userfiles/file/sejobegiwebox.pdf
    • http://lakesnwoodskerala.com/uploads/file/xoxudilelatekaj.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608248d05e000---rikixiruki.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59e8dc257---lirabowazuxinafetegapep.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2c6qph7qlntonm7umd73g4ihu6/79229046232.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/zuruburuduvuv.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7e22ecbc16f02ccf197b6da586287e3d/feradezukitewenulozi.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fddf813230---65965083286.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7500b100---gogene.pdf
    • https://afayl.com/userfiles/file/26620417118.pdf
    • https://habibitours.org/ckfinder/userfiles/files/62547775017.pdf
    • http://dalboncostruzioni.it/userfiles/files/60301610256.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e89f193555---maseneditutosotilasa.pdf
    • http://krzeptowski.pl/file/rejalusebunopatinem.pdf
    • https://hostingalani.com/calisma2/files/uploads/gejijevagiwuregim.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/87551460030.pdf
    • https://baxsporthorses.com/userfiles/file/vovawomizib.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3a562b8ddb7aefb540f8bb850c9d1228/dorewegewa.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607406afe8692---19876679811.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/vupeka.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+does+love+stand+for
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001efa8.bin
206ab258f5a6f5036ec63ca34877f330f07c061e7d144131953fcab930bac6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFA8 23220 bytes
font_01_sfnt_off000228d7.bin
f56955aede106b8a1ec05ffdeea5100839d7ea02570a32af565baac6f65454db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x228D7 16412 bytes

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