Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5cc468cb4cc6e4…

MALICIOUS

PDF

88.0 KB Created: 2021-07-13 20:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de5c74d0d51ce2df10dcc5b30424e751 SHA-1: 65652ac024fd44112c5149318664ed12e0d83fbe SHA-256: 5b5cc468cb4cc6e428a72f2a7f280e8e5cd2a9bd3486729323503b65ad481f54
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/94901be18b513219e2335498dd3a4489/zurafoposofuma.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bfd16b560---58132868029.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/52293881387.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/bejisukepewosaxadimifixi.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/poratinum.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/kevakedarifudutogisi.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/15685922986.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd40929a---49997589118.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/kexumuxox.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/490809200.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/lijumerafeli.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/tr9t75jk4qses9jdlbl4u882gg/52053787415.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/11016115717.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6f3e599688f457937a0784129f7e39ac/paxenobewolur.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sefijavusuzejujori.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/tifesubarimagagoruru.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/koberumig.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/84623058234.pdfIn PDF document text
    • http://sakem.org/userfiles/files/45071643430.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a494cddc803---vibasesajotutuvizuw.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1625636749.pdfIn PDF document text
    • http://sivam.pl/files/file/7927595119.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/228b26a291aa70b4307144332c7faf8b/50019864024.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/lufukeginikesibupexirajos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=global+outsourcing+market+sizePDF 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_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 11004 bytes
SHA-256: a1e689a06e8980acdf25a545adebafb302ed10f43ad6e60e079a2f6bfb70d367
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 18184 bytes
SHA-256: c85151803ceaef63c65ad219ea69de5edeb719b736a06933458a02824349b43b