Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b27f19aaab179c5…

MALICIOUS

PDF

73.3 KB Created: 2021-07-03 09:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 66781ce4aff0b2c809bc90fed80d7493 SHA-1: ae9574a78b903a763d351f5ce5545137481f70e1 SHA-256: 6b27f19aaab179c524e8d383cced34437dbbd29081ddb9045309ea1dfa5d5c17
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7271b685ff---90723524232.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f6a6a1ac---kelegusuxuwasirakun.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d48d0b566---63946725084.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7165135f---rosikodibifepajelunod.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d9d423f1---kubofololagogado.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962dbd8f9b4---47932182825.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/dilifukes.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nivufofokasulowagaxufaloj.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/lepipibolalefedufu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/tunaw.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/4ae848122802bdf7447a5fb2ff87b6ae/limewotugisejomojenulepiz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8e08e2d3846c26d7b7db8f51ffb716ff/javigemudikejus.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/80114204080.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/eecc7a9ebeff86fe1f4fcb9131a5095b/27445024757.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8bf5cdab---14489288907.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/tiguvukirokakejub.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa04d93dc6.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/87421111184.pdfIn PDF document text
    • http://firegallery.ru/img/upload/rusezadod.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/11558973808.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b3cc7aec---tepisazit.pdfIn PDF document text
    • http://axwelindia.com/uploads/penegesegopima.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/75510026961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=arnold+cantu+elementaryPDF 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_off0000bb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB64 10464 bytes
SHA-256: 4ecb583c796b8d78a703f665e42e1b510dc8159a1bbba5f17b9aeaa5d3042287
font_01_sfnt_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 17148 bytes
SHA-256: cdb0468e718c43e79c4cbf95252f60f9b7fb655a547fa8b6413d8c9616873a2f
font_02_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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