Malicious PDF — malware analysis report

Static analysis result for SHA-256 4186cf5b8f644590…

MALICIOUS

PDF

88.5 KB Created: 2021-06-17 10:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 28cd5bdf8a401230f6291b2616006d5e SHA-1: 7618e6e720730582c4325f6839b4a10d462711b2 SHA-256: 4186cf5b8f6445906a2a03942d2e9b8262f6bd8bb71126cfb1db652106252b02
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/uplcv?utm_term=french+a1+book+pdf PDF link annotation
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094cce621aac---fusutiruligosatazum.pdfIn PDF document text
    • https://ebooksweb.net/files/file/59111303335.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/paponusitejenutuxizuz.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb7a727deb---xurudakuwema.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c03a5a28c---79646554312.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe75a4f314---zitidojolise.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/18870388221.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/morapararabexilelumeben.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/91075266066.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f24312cb5---zaxewanuwipipet.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699410a0af---65764296214.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/449d5529ead3fa28934ba007ec1c9a85/62233708021.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b21896c94---rizadidobomifis.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2855da20---kidisak.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45b277a9e5---xazokavuworovukivaf.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/torinedewedowiju.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/9e16b46c4a7fd3f66e9f87b783e6a5f9/14518382375.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9b758b65068770d0128c936d51289bc1/17852629012.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 5244 bytes
SHA-256: 84c9803c04b6e047b855373778cfee9a05e5f7acc43575eed77f928d928b3949
font_01_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 2404 bytes
SHA-256: 4eb8fd7058246c75bfe10b610342fe413d86027f1bf61ec6184133f1345404d5
font_02_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 12300 bytes
SHA-256: af06d3d29f772ae9922452635076a63468cadf245725ed0b0f894dfe4234e3f0
font_03_sfnt_off00013d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4A 16376 bytes
SHA-256: 684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36

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