Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e457e3bf40c0613…

MALICIOUS

PDF

100.6 KB Created: 2021-08-10 01:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b00bbcbdef0e3e8935e1f928a485ca9 SHA-1: db2aac072ad8b377ec707b981a78edd6eae0aa9f SHA-256: 4e457e3bf40c06139a34b4d86231ed9825b9aad3533577584ecb4cccafbc0f25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://queure.ru/uplcv?utm_term=animation+movies+2021+in+hindi PDF link annotation
    • http://premium-house.uz/images/file/narabewevuvepepalas.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a2752122ecf3508f7a301342969b1abb/wisetalinafo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pr3s7gsr1vb1sd5loskd8sffku/86020129123.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/21428520749.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609896033976b---bojetufigerulubapujekaf.pdfIn PDF document text
    • https://chp-travel.ir/data/file/wazixiwejiwapu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba761e5ea---domalusemusomola.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/lavulezikelorutagotigiku.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/34811282791.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/14478257333.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/rifiwaka.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a1101bbd2---pokavej.pdfIn PDF document text
    • https://85097781.com/upload/files/pimafirani.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/50451247264.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b4b0a4d6fe49b04a8eba20ab6e2de1f1/jajilodoluwifokujimadub.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/66972215447.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae200cec94---37967816860.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10edb0f82---sigovaruf.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e58924ccf---85981487439.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c10baeed1fd---71650384863.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e596440cd52---duxobejexegegawi.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/05d2010742e21ab2ec671d8a11b61b55/99621933064.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/baaa2f0320395ace703c8e3268a47042/giterajusuvoguxukobe.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_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13999 10708 bytes
SHA-256: ef2280319e862074281e96c5963552b706f3e1aa01aca9189102cbc547e382ef
font_02_sfnt_off00015222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15222 19016 bytes
SHA-256: 28c6418ef49ab6ee8b7f25a41c83a3b065053d3406746e9eba9c3e455986c3f4