Malicious PDF — malware analysis report

Static analysis result for SHA-256 eedb2c8ab3d069f7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 10:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c9ece8a70cfd09faaf69c21e107b5489 SHA-1: 09f3514fcf8a758f82243e0942719e4fe2fd20c0 SHA-256: eedb2c8ab3d069f7a3b9ff5a16d85c52fe7ef31bb930587587aa323818a84994
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8868eb267d---xetikiwegatusa.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075366c4ac06---zeximomunefululov.pdfIn PDF document text
    • http://balone.net/_upload/file///zujisogofavapowori.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2c0671310fb316bdcbc8df72eb5ca19c/posofefeguvarafelow.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/fitepa.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/70378475622.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/22839881291.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772461848c1---7972802249.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ef99efb5e---20745879030.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/35691839803.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/83952584143.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/17975000585.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9960269affab60b4b3c1f93168afc27b/soraxukizibimumubo.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tawas.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/zufanejevepes.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/37962216789.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e821e06acd9---71578468445.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/95996892730.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118e25546a92---bedarome.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/lawofidalisabukiwuru.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160720bfc053fd---zinogomolofudebeg.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/80114706267.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/36529386489.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/zulivubupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=glaucoma+pdf+gpcPDF 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_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 10408 bytes
SHA-256: def689f6ee4d557f3bf2442f9768d2b92f1fdef2a3a92ebb1673a6c02425e31f
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 16120 bytes
SHA-256: 54a912585fc178d3810459927fbd9ac3063e32e85929ff82eacc1d67158771ed

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