Malicious PDF — malware analysis report

Static analysis result for SHA-256 56935c11923b1b7b…

MALICIOUS

PDF

86.0 KB Created: 2021-06-06 21:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 476dfc23fbe1a15c1c91ca54aa7617e8 SHA-1: e27b8811e87b4c64c002349bbe37f367d904c3c9 SHA-256: 56935c11923b1b7bf3a77dc79c993a21dff01e3a2e77c4f13fb9e8942da836a3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and ML classifier further support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8344

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://inwebjor.ru/uplcv?utm_term=stokes+law+and+terminal+velocity+ppt PDF link annotation
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39fcc99820---77241591087.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66b93c221---fezuxerorolenajewapaso.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160768b5cc840c---53054988995.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/64aaac295420895a993b636e3e43c9e1/befebafawubamurusi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08fe74859---58320817261.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/41647399585.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/83443125221.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/8615828669.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sn6korjbehms2ih61pkvadmjca/89710452647.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/93611619666.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fatozeruwetokevule.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497ad6c0e8---56097970775.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3a076bd3---7399689646.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/f12lh3ah9c46gv33kp8u6345tc/fudilugolukidaba.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/85765367867.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/82614535690.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/789dlcpjr3gind49emrdf86ro7/dukusitisokezaxofobiroji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 3076 bytes
SHA-256: 53c8ccdbd2b50ec8356a74f11aeaa3b9eef2dae15d1bc8c9103be6bcd19106b1
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 5428 bytes
SHA-256: 0e85ac286802b2b291d120df2ac17c49cb29e8f49648e5ef4d16d76ac5dd8eff
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 14532 bytes
SHA-256: c30a67129c97449c02f23742a408872e672cc8cba21a3a96beee94e8956e5f80

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