Malicious PDF — malware analysis report

Static analysis result for SHA-256 811ff5d6effcc3e5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 21:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cab32e74010968938eaa623f13782915 SHA-1: 16d05591cd30a3b1f5f67f9be97df0c9d0902c9a SHA-256: 811ff5d6effcc3e5c8514fd56ef7758c97e1b54262a4e70ebcdc088aa799e360
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of distributing links to further stages of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/62949001825.pdf In PDF document text
    • https://ever-progress.dacola.com/upload/files/82629692685.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/resonabemuxajol.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/lezaruritodumadavevarig.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/dc1cc63ff10b5861cd27f7073a2edf63/58630196826.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/93472844928.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/en6fv6v7f3cbj91289ag8i1u03/76140387236.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d83f40f9---1700650297.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/laliraxadowutumorifu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392bb0e74cb---19595716900.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/wabuxolojoduxosa.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/40293654611.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/dasevexixovewilija.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/fudatujolijexukena.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/59403199051.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/xiranagubivorenamopog.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/zulelepitabutelegubediko.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/nodimuwudofefonem.pdfIn PDF document text
    • https://value.ae/userfiles/file/zekexaga.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/pifewazasaduwid.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/moteluzepo.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/xexugojilizoxovegarud.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/kusilasinomok.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/dedefufajapasunev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=music+mix+apkPDF 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_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 10224 bytes
SHA-256: fc75f2eb62dde2b04029be1d6223d96700ce5164f4af1c832585bc4263c1abd6
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 17376 bytes
SHA-256: 24ea0cb0f8f8a51fc3fe7ff3540d0c833c0d42663b932b9a399c77abbdf642ec

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