Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59c52f020f456b7…

MALICIOUS

PDF

100.1 KB Created: 2021-08-03 10:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81d1bf4c547d9b1d1a97e09f9a6953c8 SHA-1: 69cbd6064668345d2baadd734222e5bd3bc7e269 SHA-256: f59c52f020f456b712714c1d8323c2c5500e8d56602c49416f3c008da44e9a99
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43e293072---5507096227.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ta0su7ea6l5b5hbpeoc3j016af/rulufufisozawarorifi.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/4698140042.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/fezeka.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/39e321e178180b3e1bfcbcf9a5dba7f2/64931102404.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210801_50E3F297D48E6B0B.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xegisoleretibefigu.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/wunakawofavilarev.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ab9d7b78---81807977769.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747d472f0da---kigijalisiran.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/37967119229.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/24085732394.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/jibopoboguluvilojofoxeri.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/rolabibajixutijazivoselop.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/37bej3nki9m1vkd9iprtgm6fa2/gejupapetufinokorad.pdfIn PDF document text
    • https://advik.net/userfiles/file/zonuwulewonidewuremom.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/suxikabupilanogapan.pdfIn PDF document text
    • http://minhanh.com/files/lenebuk.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/24965480738.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gemopubufidusepezoxasowex.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609794f66e1cc---pasoso.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7b357e23---basonesofenalipemibat.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9545fd1019---47938155047.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ce9b01c0c9510f86099d73fbaccf1029/97107195340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=b%C3%BAsqueda+implacable+2+pelicula+completa+en+castellanoPDF 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_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 19136 bytes
SHA-256: e3bfa71b49cc66c333a8bc9db8a88cd56391e289b363a883e35bac1890aac2da
font_01_sfnt_off00014d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16556 11252 bytes
SHA-256: 0ee26f754ce8266e15c6e906f795ad6158f03d5559de3647463169a0ad11d26d

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