Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b50396753a588db…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 07:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dff8bd235812163db04d1749cdb499ac SHA-1: 7463eea763506e1b310dc4a915b50e0df4b5d4d9 SHA-256: 5b50396753a588db0a2dcd0240c3a1aa65ada0355302e26968e4418e4b869141
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing attack pattern.

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 https://catamma.ru/uplcv?utm_term=configurer+compte+outlook+sur+android PDF link annotation
    • https://congnghieptauthuyvietnam.vn/upload/files/90167784027.pdfIn PDF document text
    • http://asvpp.fr/pdf/10131804253.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/64093210949.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/tabobutirazalefedif.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/47dtl0imeceb5j92guiej4hah8/5995009505.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630728633_05f94d56ca.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/sejavowo.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/42794432647.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614256fa81aa6---45653529394.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c95a70547---19012615053.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/kidevuguraxirot.pdfIn PDF document text
    • http://poliinc.com/upload/files/21125876640.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/jamodabugetilin.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131557e706ac---46534280557.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tifakolugit.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab96ba70---78619601777.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/41604267792.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/gizuniwis.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/fonujedivoke.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/43848875383.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/79c3186314900239545838a93286c078/dawefiwo.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/xotapumuv.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/5782020039.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/xefururiperaladesemoz.pdfIn PDF document text
    • 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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 20700 bytes
SHA-256: 9a68371b673a2e10a86a4d4a8e8e0e4caa40fc315a487e36657196896ac6b14c
font_02_sfnt_off00012912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12912 11188 bytes
SHA-256: c7f9788b39e93233ad0337e50dac5a2a09f734b46ba04be3b7c71a333cdd58ff

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