Malicious PDF — malware analysis report

Static analysis result for SHA-256 290f03413819cc25…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 22:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 223295b3de34eb41acccf9ee8ec32b32 SHA-1: 8f808875ba787eb5e3fcd3982b23b80740c3a59b SHA-256: 290f03413819cc25a733319931fc2ed55f3ddb25157682ee5c2de26693ac9054
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories. The primary attack pattern involves tricking users into visiting these malicious sites, likely to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607201279d81d---6825171040.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afa74a3ef---35333456450.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/kafukagafasibos.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/89988057336.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vadulijukeronajig.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98b1ecb34---54423884557.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/basosu.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/widiloxipifodofuxokukuki.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/firesajugudenebegexixebe.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/79511694708.pdfIn PDF document text
    • http://ashioke.com/images/library/File/renawijug.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/befav.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/vutapanomenobelewanil.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/56236453381.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a2e1d3841---93869567474.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d9864787---72379458957.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee171118a2---rodazorifezexuzoga.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab601b71593---zunopajadasafeledeb.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/vofikhfg8mle52bc87uq1dj1fk/77550532785.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2ad3f0eae---38304018878.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/kifobapaximolupujef.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7b4246d0---86650826868.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0d67b7ff---rorejagijujemibenixesati.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/93456440563.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d281ca211f---73415536773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=archie+and+harryPDF 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_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 10132 bytes
SHA-256: 523cd002f2bd656f3cc0abd6294b6a9ef5f2c9725662a314202ba7cc76e9bfd3
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 18600 bytes
SHA-256: 96fe6504ce817598b9c5ae8031761ec5420174f04dade4369f2e0c6f28a00de8

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