Malicious PDF — malware analysis report

Static analysis result for SHA-256 88050e121dcd9509…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 10:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85a3625f3abd064f862d7343d33c5198 SHA-1: b78b68276dd30131983b9e05835868c1cd2fba5f SHA-256: 88050e121dcd950943f509e140cc0d5b21c58b48294543ffbebe5d1f24fe2e2e
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating an attempt to leverage external sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/pasuwikubivutiratogikexi.pdf In PDF document text
    • http://getvisa.ru/images/File/2241479866.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967b1b5d250---26695137153.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/dolijo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/92437019484.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16104504a209be---nomefolinoko.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c5240b62b---vobovukiliwamek.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/xesiwuxakidasemibimis.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/40914083422.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a80b623c---85438406413.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/wibekagibofusokuge.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/93528525096.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/30003616772.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/voqd67iul7ids5f2us66b7fb32/tirurenaferarukuk.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608973743c4b6---93742123157.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/fozujowijezerufe.pdfIn PDF document text
    • https://bursac.net/userfiles/file/numufemiririnoto.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/26113918763.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f96be4c4c---jelumagabored.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lanenasevufemuz.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/gifunumekolapezuzavaj.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/68794265113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=irregular+verbs+worksheets+to+printPDF 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_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 19452 bytes
SHA-256: fe30d370d3238f66b988784a20cba90dca6b78b531986153f1e8d86cebff8444
font_01_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 10968 bytes
SHA-256: a020c6a6305e48d662667adc0e0be49c78a9d695f90dbe2cc43b6eb04c003a9b

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