Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ac5cc94fc59f07…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 03:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 472a9148c17619ab0c209ca732278196 SHA-1: 101f786636d2619956abb61b9b95bd8b3210c2c6 SHA-256: d6ac5cc94fc59f07174615439e8716f06b0270e228fe8e7c8e0d7e4347ee126f
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document's purpose is to direct users to these external sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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://daonshop.com/files/fckeditor/file/lelevevuvadupadufav.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac543e3a1---75586954884.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/33802661114.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9s8cg0och9o2dassd0b7nddfgd/vekepifonuwinadetovar.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/fubanipidodevojapogopa.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/32036825113.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ce53abc8---mojexanutam.pdfIn PDF document text
    • http://midel.me/userfiles/file/96142730672.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5f0d0c580---sasumuz.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613495084a0fe---67163833888.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607934f930db3---67350682847.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/jakilumuzeraxokex.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ec4112747---rujowikivisuvemunexogi.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/80110564084.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/el7hlnr2h1suptehcnrehacqre/24093839283.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2574a3a194---todesegog.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8d278d0f---78380475632.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/wujen.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085035301ff6---77725876104.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/46642764193.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/finevoxeb.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/h1k18brti6mkm6vgd82luqv0oj/29372279922.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///xutirisutidegugudazaf.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16245826423152.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124fc719a2ef---88025522157.pdfIn PDF document text
    • http://elma1.ru/!upload/files/74329153427.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/91409655946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sildenafil+bula+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_off0000ba20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA20 15920 bytes
SHA-256: d2e9cd3b17c45d7ec7c5ad09f747b1680845a9a51d8a3c000ff6def78ccc8df1
font_01_sfnt_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 10320 bytes
SHA-256: f1ac5a25a68ac4d6b7878710677a4f95ea18b2e618cfda8f59255882adea5686