Malicious PDF — malware analysis report

Static analysis result for SHA-256 893303eb89009d82…

MALICIOUS

PDF

99.4 KB Created: 2021-05-11 21:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fa0e5619e6d60f4c392e85c73b56613 SHA-1: 8cd7c32f8380708cd04fa0d106041f24deb3b3e7 SHA-256: 893303eb89009d8207b58cb3a5254a9ba84c35f2691bddc98f473ce85545ea71
154 Risk Score

Malware Insights

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

This PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8870

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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44a689154---71514161638.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090cf7abc827---sifuf.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/c647lh7jkeitmv1vblmes19vd9/bubuzo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e5d934df---72565774408.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a24c824392252c0f7cb0627cbff4fd1a/mivukikekowud.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095e7fe6158b---lewevulokuxoloxigemirokab.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19fb85a8766a77ce46f2537732d9883a/penaborogebuziralomo.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160784e0fd1915---tipagewofeze.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087b34294a51---7899719935.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c5f4da58b576ec86cc6180ad3413104b/lemanivijipulutep.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbeb016d8---midegotewa.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f35c96cc572929f688295081891035c1/8446487434.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fsvbijc5o33pu5bjhsook95ppt/rovamuvokozujukile.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce289601a---paditiborebo.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608674a0e9ae6---koxar.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609794566d5db---mipajeviwuvopu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fiverr+proposal+template
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a5b.bin
c678454813281533a9ffce5580cf9e057f7c937002aac08f855d30efe394f2e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5B 4980 bytes
font_01_sfnt_off00016b3a.bin
f7ef10bd837cd083892c5c65fb36e6b30faef423c67f49ea4821d1cd5b619e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3A 11808 bytes

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