Malicious PDF — malware analysis report

Static analysis result for SHA-256 72adf5f241d9e1cb…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 16:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93304b01e917de46985be272bcd6c1f2 SHA-1: 385f2c773f05ad48199b17c44cae5a1119932876 SHA-256: 72adf5f241d9e1cb54d92a1bf2c38c00823494ebed2fc6fc9d2cd94208ca5128
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, 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 redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports its role in distributing or facilitating malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=rsa+budget+speech+2019+pdf PDF link annotation
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/42558191a0f3ed432e495c89b0789837/11406308867.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5146c052c21427e1289c1f8f61ee3efb/povefobir.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f45686733f7---wiriwovekojosabuvako.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/bivenakafi.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/mejinofuxafavapafivo.pdfIn PDF document text
    • https://slide-bearing.com/d/files/gububulagagakax.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/bojip.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/zipotazufijizevigimowoza.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/waxipefapel.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/35813592141.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071512a108cd---48971696570.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a396da9e430---zimurekamop.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/22117274389.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/43623938735.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5f90596cd4a32c7faaefaa4eaf1ef37b/kakixa.pdfIn PDF document text
    • http://mesterek.net/tmp/71288433978.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/8975579456.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/94140068459.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aee724f5de---43079717531.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f072ed9b---dafelisuxebavo.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/xebamatababux.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ah0cseckd21qvb1arum515lfu5/49525733203.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_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 17496 bytes
SHA-256: 4ab9c1586358f2d0f83cce3016f1b0406cc7e8a9c9c4db5fcf5bcb01dde439df
font_02_sfnt_off0001373f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373F 11184 bytes
SHA-256: 466fbcdbfb7fe27d9b869c4a36bdc69a2cf302a4467af404c7d7e184b5f6cd8f

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