Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c82e6250d2d1b0…

MALICIOUS

PDF

63.8 KB Created: 2021-09-13 08:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c309667da19aeb31159ca83495ca384c SHA-1: 92b6ce3ef597b6de5a8ece8aa74888d9b4d2bdbe SHA-256: 59c82e6250d2d1b0f6ac7bd02dc775473556882b644a77f2b3a03120dcfca42c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6527

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://smidgel.ru/uplcv?utm_term=free+fire+diamond+hack+apk+download PDF link annotation
    • http://kashima.cc/userfiles/file/85874182780.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/19774485734.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/wagosum.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/30712925223.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/0h6g5vrudtfjnpt3stpps0dko7/67896597452.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/vowuburolezitafewiduvolap.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6e41919827736e2c9eeaed4bdc9f56e2/66840084315.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/985778a718740538e92d86fd5dbc9e6e/32775536712.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/xumaxamafodosezesov.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/23957270654.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/kukewasidezudapetu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613746bf1990f---50508297785.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe10603d3---29080624073.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/newona.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/2929739910.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/tidojifudojijexewe.pdfIn PDF document text
    • http://ndt-ultratech.com/files/soxosodo.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/wepeju.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/97952394912.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/77476447377.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/pusizexa.pdfIn 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_off0000ba8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8E 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 10776 bytes
SHA-256: 82340f163dcaf7e6100a65bf73651f799d0f6b92cbf29ecefcdf675bc65f9d46

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