Malicious PDF — malware analysis report

Static analysis result for SHA-256 f603b154b3d31a14…

MALICIOUS

PDF

72.0 KB Created: 2021-05-06 20:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b024a54cf5095dc5433eb1f75b3e683e SHA-1: 13d24ea193194adf2d38cd3930954ccfd5314026 SHA-256: f603b154b3d31a14b917d99519fde750ddf690b5b750b49122d0b4f26663b80f
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 are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8179

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://pistant.ru/uplcv?utm_term=chicago+manual+of+style+notes+and+bibliography
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/svbvleouu08d7f81pl2v2it74d/joviberifivaleviluzo.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609347160ab8b---xagepazonunufigewebaduz.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/312acc0a9a89e27508833ae47308cb1d/70920818419.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e0681d5443017a5f8899389d4def3dd3/timanuxib.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b0467691562dfa8c6b9164e1ac949e64/17607921527.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e991b406d1---rubifurodewapujisur.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfab6ca8d---28130162754.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607822a7408a8---woxubanosafadodifuvegozad.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8bc27b16d09fd70c6a00184a2c603a10/29671787811.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7b8c6383---zulodezas.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/u3l29dl9fqsi5atbl6o3ci1bg0/kugipodiwolirurud.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/p8qhqci2hna95l8k4ud0ussuo7/duwubajamod.pdf
    • https://alakharia.com/public_html/userfiles/file/vukazesegu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9b729d82---67442229970.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f208998743---22534953559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4a.bin
b661633dbf01cb6c5603508104c717ecb289c874a72947234b2366f6a3e156fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 5716 bytes

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