Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57c151b562780b8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 12:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d73146362f8177d342003edcc8785be SHA-1: ed7c42e0bbe4852cb759e0079a019f705f56a67d SHA-256: c57c151b562780b8cb98af45f718dcfa95e19b3fda621f11cec22f2e13fa0d6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, and the presence of 'utm_term' parameters suggests tracking or campaign-specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=the+prophecy+4 PDF link annotation
    • http://dorapeyzaj.com/userfiles/file/61220213611.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607103017b2e8---55172608735.pdfIn PDF document text
    • http://winso.tw/userfiles/file/vedup.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8e6df0c26643f75c598dfbe717da311a/zodasitiguniwitorifono.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/33827773733.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ae68bc582e5c85d25879dc67f4ab8843/kedegeg.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c78f64e8ccba64e4afca0914d2ef65cb/pegisonegawo.pdfIn PDF document text
    • https://auto826.com/uploads/files/82819353129.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/57277669032.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/32557017134.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/9548567929.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160711ad0cb157---kedapu.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/putabisefedepevagosil.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/kudosororewa.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8d8d17b58---43973616797.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609103da0205c---nozuwigu.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/74384801652.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/b84crnmndnvvbrv4dtissl8sn7/jofuxesalusepabakeg.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/97627058392.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/da7b30466758432bd91ea6ab77c089f3/89371528940.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607747f663ad7---kumazexigowulonitij.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/zamedilazowaluxol.pdfIn 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://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_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 9956 bytes
SHA-256: ee9007f4edb80fa35cf31d61f649888abd231de6e773a9e7d7cc4a63eddd45ec
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 18776 bytes
SHA-256: 5479287b283ca25d210f8274fa10c48f7248525a0fb2c6e910ac986efa16ca88