Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c654944362f65ff…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 03:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4295028adfdd3365642778e996a8c74 SHA-1: 19b159e23b9d203400e1a57c35bd25dca545527a SHA-256: 9c654944362f65ffd7b892df5102d2eb59537c2756ba1aa83dfe238edd492b64
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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
  • 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 http://kanalizace-ul.cz/userfiles/file/jokiwifux.pdf In PDF document text
    • http://vers-ma.de/userfiles/file/50204298992.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/jemerukejedojamexexisis.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/kesivusasoxulifuk.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/togalorakalubu.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/69202436127.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/pawimosulugulevagu.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/1021538821.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574521cd7c---19042784944.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/buzubulalidozifup.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/63471732842.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/gerefanutepuxawure.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/wasinisawilo.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/sovisaligemed.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16139353e47168---kepeguwetuwizegoteb.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-6/20210906182842842975.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/gofatesowerogi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ecf7235b---15724830300.pdfIn PDF document text
    • http://shahgrp.com/uploads/26013811442.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/46234638050.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/sivuluwuretozokiwesasoj.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/vakup.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/55486102356.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/33754794919.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/87789167810.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a8d79eea818e8a036de72ab7afe375dd/raxewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sending+resume+to+recruiterPDF link annotation
    • 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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 10680 bytes
SHA-256: bfac97787002e6c1190dae8a7df22feaf73e60d45bd5e776b171b854d1f74e87
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 17248 bytes
SHA-256: 21f1ad7850a737e14376c7b7228a6d5eaaadc3bfb29184c6dfaaaf38680be07a

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