Malicious PDF — malware analysis report

Static analysis result for SHA-256 24491e3e99d1b855…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 11:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9ec3eacdc5839e334d21efb8eaaf025 SHA-1: ce0afa5088cf57f1a510e3a7b7cf43062c843f03 SHA-256: 24491e3e99d1b855ace9fe4dd281f8f08e91bf7bdc7d7d24515b9f4cb441b585
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest the document's primary purpose is to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://mmszke.hu/files/file/vazuti.pdf In PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/1e049f1c096897d49564651da4fb1430/51911099298.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/takogagu.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/wefupufifeletupoko.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4af8ee2b---7479517282.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210530041727.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb20b3aa1---nitarizefirefevowig.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/95349602376.pdfIn PDF document text
    • http://grabnerestriche.at/fidagugewarowev.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/nedavelobabadodutorufe.pdfIn PDF document text
    • https://davaocarrental.com/images/file/47402416784.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/32695647638.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/wevodira.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/51262664278.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a826812d32b---99479127267.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/gitisenotalaturoj.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vqc8e0v5d8umuq24ju9utklusg/xamowep.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65ee8e762---37565964660.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f7beaedd---33792434084.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/wimisutag.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104819262897---nuzawakinoladubapitesanod.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a151bbb283---48408009119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=micrologic+6.0+a+manualPDF 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_off0000ba0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD222 10624 bytes
SHA-256: a2c2d1f22a62053f04fd3f1014701c0b8ce3d3ad4d009e8eaa97bca61718b8f2
font_02_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 16248 bytes
SHA-256: ac143a918c95fcfcf60c4aa082b87f9260ae8c4959e9010a07117ae4cba5f6eb

Open this report in the interactive analyzer, or submit your own file for analysis.