Malicious PDF — malware analysis report

Static analysis result for SHA-256 628a79b4c38c3f82…

MALICIOUS

PDF

73.7 KB Created: 2021-06-12 17:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9f3d67f637f101d6cfbefc7959935f5 SHA-1: 50c2e6ca447dd049a0020a8880946103491bd825 SHA-256: 628a79b4c38c3f82164fbb3fef557a8bebb138369e765de894a41a713ad6dbc1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support its malicious intent.

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://chcial.ru/uplcv?utm_term=cb+background+ganesh
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3ece12fe1---jakitokosesinejapux.pdf
    • http://ekotronic.eu/files/file/4285212454.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3a54e8c59fd7d6b764f6ea5250e6e17d/rotafenotoripon.pdf
    • http://anpo.vn/upload/files/88418574887.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2897936ca450c9e29cb08df3bf60ec4e/ridufefewadilato.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096faa5cf450---37558761403.pdf
    • http://irinaburmistrova.ru/files/rigelijogodokesapumirada.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fd4ec1a7211ab09056fac2d10ead2a22/87771368034.pdf
    • https://hospvetcentral.pt/site/upload/file/zikexajajitiponavijeduwes.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f190200143---48692948334.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/c09mda8dp6mpe8qbsj2k9k67u3/21936007795.pdf
    • http://tuzvedo.hu/elemek/file/1445496886.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bcc6b0d2fb36bf814fc10096d24ab8a8/44187204150.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/2b499ee719e575b2c9898e5a0e640ad6/toginiwitoruluxuriw.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/t6vcjhes66o0tteiiofdb6uvgj/xedibepala.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16097afc8bf669---3657597797.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53e.bin
63458003d2878c08587aeb81c02d6bce803389d63f327985c9231b09bd7396aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 5280 bytes
font_01_sfnt_off0000f723.bin
1bac7daf2a9b5033ab3ccf17cb64b3de0f9a577a781b96289b82c1e1267c6436		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 10556 bytes

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