Malicious PDF — malware analysis report

Static analysis result for SHA-256 245b23278b8e8ba1…

MALICIOUS

PDF

72.6 KB Created: 2021-05-15 16:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ea056a8766fe60977757776bb669c3e5 SHA-1: 74b08e33a60754108e336201650ec2e3e6ad721f SHA-256: 245b23278b8e8ba17ecaffa575c42908524de85aeb1fd34d96cb935dd8ac4dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'guided access' on iPads, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://catamma.ru/uplcv?utm_term=how+to+guided+access+ipad PDF link annotation
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bac33dfc730231da874573d872ed1d87/82242109455.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e5e412df1---55942135776.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e08f4480fc---29375148435.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7492bee8---xesunutitixefuramafeleju.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093de7f4610d---79271777498.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8atgh81ugri624fihnom5ppja1/17810423549.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ae069f39---tilogubibenirubalomavowud.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092908dbefc6---82879281264.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/71a1aaabff05a6e35d7a794053d9f667/jodulavini.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/246bce02199237b9e8bb40768331b33e/popokikapekaraxalujew.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/nogozaxu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16095ea28ea428---85518343924.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/saburufupolet.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/460716929b3e02b03e8b972fcad0abf6/23056867771.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/90783731068.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/49b00e8e0b6f114faa94abfae154b942/49961611765.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f5jpef1gd68mj2g7vi2n1022og/52317489519.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/mezazowomapivivurogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 5164 bytes
SHA-256: d2edf5c79693af2a496d363433ce23022522c60c28adb0897902ca9f4c0206ad
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 10324 bytes
SHA-256: 4e51cd67a552f990b331513565836f2116473d440929a5d229d4efca20b6ac98

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