Malicious PDF — malware analysis report

Static analysis result for SHA-256 191cef8d7a81a219…

MALICIOUS

PDF

93.6 KB Created: 2021-09-08 05:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5603cd30d3be51c91b140833a4b3ecd SHA-1: 3ccba0f45917b2ca4fbc4213f4ebaa5511698a1e SHA-256: 191cef8d7a81a21902d6104c4c07059744d96474f74bcf369cb7e37eb2d9fff9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised WordPress sites hosting PDF files, indicating a phishing or malware distribution attempt. The presence of multiple external URIs and link farms suggests an effort to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608424d7e1f60---fofobakonodujoluwiwiwomer.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b3962854---98037782943.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dfe59caef5fd060f6937e3d053b72bac/87288746550.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852b796df2---bumuna.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/7c25f87b60398ca4d9af22f4af7beea8/92953967948.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/11046934557.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a3225ff7bb51193f9648945aa15e4f12/68762698468.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/rilorugugi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1e8128295---99467663606.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f434965945---36552880866.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/lakojudabuvugaramobedi.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/cbea93f789bc696fd4deae1ce51f039e/98929096428.pdfIn PDF document text
    • https://binhvi.com/upload/files/56490019910.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/20314674732.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/nevimabonuvulafalu.pdfIn PDF document text
    • https://combrooncom.com/contents//files/55898023343.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/gumotedejedawigo.pdfIn PDF document text
    • http://merwepizza.com/upload/file/tugonogurulodinefuriker.pdfIn PDF document text
    • http://remobudostol.pl/pliki/rojunepofibifiluvaga.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8dab1fa453fec55ebcd2dccb948b9b0b/39880312163.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611718cf8c9ef---silizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=o+di%C3%A1logo+socr%C3%A1tico+pdfPDF 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_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 20244 bytes
SHA-256: 05f5fa96bdced1dcc7e9d28358549a7e656ab740de9d313d9eec46851654628e
font_01_sfnt_off0001369b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 10600 bytes
SHA-256: 09c87687a685753dec0caab60c1348f42952bee09498fd11a4b005b8eaa99397
font_02_sfnt_off00014ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1