Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fc6f89c9642a95…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 04:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a04f0c7200e7e3203f4c7f48ee6ff7b0 SHA-1: 6848466ab64262bb4bd8af42b37516f3424b5b93 SHA-256: 73fc6f89c9642a9510c01bfa53f0832a05e19974ba26e9f40a746fdf52cbe6b3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of external URIs and link farms on disposable hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7ec68aca1a71e4227b59a67da3ef8cf9/xagor.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745f276ca15---gaketagubotilegeke.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f4dd05fb269292c9610c5517ebe2df63/winizevixefuduvatujogamig.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xugorotewijovebu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc034be69e---seguzuzinivov.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/5648310539.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/97930258753.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/xowewipogalofer.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/os96su63bc3pm4amuv0ue0mclm/91972646948.pdfIn PDF document text
    • http://axwelindia.com/uploads/xedusev.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/78593575468.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/39f71b2bc1e36adf4d15b3472865cb67/dekaxunodagu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5okkdrsrln8m85n1r8m0pckqhd/nagumofezodofelesetepej.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/palulozuxut.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/27805104450.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zusakugamoganepasamidafe.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8a279b24---20269732685.pdfIn PDF document text
    • https://hgb.se/filer/file/botonigefikusu.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/jukunaj.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d719ffe4---38857380234.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/49605075712.pdfIn PDF document text
    • https://ka-base.no/images_content/file/48810970631.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107942b181f7---vagodumifobapifipifokeg.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/19kje5129r2omjr9upl2ekmet3/sakajumusebirisode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=causative+of+have+exercises+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 18680 bytes
SHA-256: a57d65f1e105166ed99e7caf4b4d991b966f83a8e5d2599c3a8dbe58417a1967
font_02_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 10868 bytes
SHA-256: 04fcf3ca6e351b361493351bed82a2d1bfd761ebb5e8257b8ff3de7a2f75f6e6

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