Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6adacaaf8a8a68…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 14:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73018808a8e9f0222c6dc14290a5cd91 SHA-1: 6cd6a60b49a022478d554f774376de1cbb93257b SHA-256: fc6adacaaf8a8a68b0337251580c2d7ed7ee2c49d10e4aa3cc922b56211adbcd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other domains hosting PDF files, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vds-construct.pl/userfiles/file/razevupijekudugogu.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddf4c0804---44124231981.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abadcdbcbc9---38862946518.pdfIn PDF document text
    • http://trivio.it/userfiles/files/totawafenokawojozo.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/55856830607.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/s25ef9c8i8cur5oo8t4h5hn9u6/83362580101.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4c376cc6feb8b6352e21f2a6bb6ed496/kiwudopaxen.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/nisawavuxinisedemovebabe.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1ccf5eb5a144f6c1866cd8e264264ab7/7737986566.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/penazowuxuje.pdfIn PDF document text
    • http://skupka54.ru/upload/m/roguwulugewelejafo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/iimcuu7e9m5igctoe7og9l1i33/mutosewedev.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/33948281143.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/90604821245.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b914ad0e14---kuzivutuwofudewatav.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/26096763396.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6768505a1---95891123092.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/puxenevejezobeluzowuzate.pdfIn PDF document text
    • https://bio86.net/fichiers/4151361378.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xulunazinoletuzebe.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ac653792b32487e085a9f99bd3fb06a/mibidiwidanixakozu.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6c2852e3c32fe1216bb833caaf9dd04b/sufotoregagotiraged.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/popedurogolakatoje.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/libewitozotu.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/67636988941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=utkal+university+msc+physics+syllabus+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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 11284 bytes
SHA-256: f74aed8e0ddf7d6fe7e3d122fc9aaa5c4fd82b975b79f765dd674a1be9a5348d
font_02_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 17948 bytes
SHA-256: 1d596a116fc9fffa5b1b5b78ebfa82ee530f6dc4f9e5cc8bbf6cc99ab232d919