Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ec7b56c2b9afc0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-27 00:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21b6c7f6973e9a61a22cd42c5ef46058 SHA-1: 29ec8caf7ff50bdf046622339198596de21037e5 SHA-256: 24ec7b56c2b9afc0a9c903682f228fb6647f856f94ad3c24512d0c3b2f7dbb69
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=phone+speed+booster+apk PDF link annotation
    • http://fc-junajted.com/upload/datoteke/bikoxoserigo.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_02_21_19_52_5955.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902180612.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/57637619563.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/volesazujemizadebon.pdfIn PDF document text
    • https://paperland.bg/uploads/file/74769029982.pdfIn PDF document text
    • http://recrute.fr/files/files/55316464386.pdfIn PDF document text
    • http://zmz72.ru/files/file/27794571010.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/fazixapufuxo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146801283d45---4659212694.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910195832144497.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/mohhdn3ar3pl0dnd8of616q5c3/makigisejitosa.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec30b1bf0d---xenekozegamubuteju.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/94820710420.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/monegujunutomipokefagola.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/gogunikedusinafedewerirub.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/82600571454.pdfIn PDF document text
    • http://evola.it/userfiles/files/71321299320.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/81582569294.pdfIn PDF document text
    • http://cochemical.com/upload/files/68946400255.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/22957686805.pdfIn PDF document text
    • http://prompol.com/media/file/9854849110.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/wibinomiv.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/rofuvug.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_off0000b636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB636 10584 bytes
SHA-256: e6b20284e70b2fdbc19c60ed331b7809b1939144cec212bfb6e6958b2fc0a66d
font_01_sfnt_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 19128 bytes
SHA-256: 7e1d235670d8597635e567ce3c6e4774af695233fe8d412013a41ba0acfbcaa8
font_02_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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