Malicious PDF — malware analysis report

Static analysis result for SHA-256 67caa7dae8db04f8…

MALICIOUS

PDF

157.9 KB Created: 2021-06-06 04:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 77e08cfdbb0f004240b3c32cb11612b4 SHA-1: 34eac0069f51cc1b5b51194ae7129c9873267fed SHA-256: 67caa7dae8db04f87c7685cb3e4e90af6b6be2756d68b0548a9013c4ef6724eb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malware or phishing content. The embedded URLs and the heuristic findings of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://drafthe.ru/uplcv?utm_term=pool+live+aid+download+mp3 PDF link annotation
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2cc797df9c60ca31615058100a51738e/newavin.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/melid.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/42258eb99217f27068e9eba881427d4c/93784706055.pdfIn PDF document text
    • https://migger.dk/userimages/file/zurexazaduwedigesosimo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b766236f---divoxiwimiwut.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/85464356370.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b5947183b5ce5d6aa21790cee9396cac/busetomapobadifobogusepe.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a0b4c7172fdc185b7e1488de682b957a/xawadazuvijapidumipelixo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3a235fa3b11ddd996461c5879355f37f/9068063156.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0005bd407598977f6b6931ccb6629b74/mefapoxaturizuvefunat.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/21385677013.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/47dec80a584e34bde5641f0ac7162fa2/77911483079.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d88d5e38d---61366966003.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa793abf7bb---dixetunu.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d0fa5542dd5b5591ae1dfea2bab0abd1/40486925165.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/61357235536.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193477b553---48396241031.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ce47c8e1---61290434443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2300D 5148 bytes
SHA-256: 8eb23737ca983fbf4d5196b5b017c32608b8e4788890f4039c0148bfa9c2524c
font_01_sfnt_off000241a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241A2 12116 bytes
SHA-256: e8dc81419312e4c642e122b1a80a8e64ecad619633813e7b3130bbc1a9cf5bdb

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