Malicious PDF — malware analysis report

Static analysis result for SHA-256 452b7330ecb6b9fa…

MALICIOUS

PDF

107.0 KB Created: 2021-07-02 06:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c1147aa2a4bca1e78329f2e8561f8a63 SHA-1: 0e7779c7d2d77a6e108d6c39737d15786c79f015 SHA-256: 452b7330ecb6b9fa06dd24ccfa6fbaec8ffbb71c99b9f584e1f44b9d41cac01c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The PDF structure itself appears to be a collection of links designed to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sotel-perm.ru/site/file/24089265696.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2a32303fdf79f404b2432b17ebc84ba1/80403805289.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/rujerurokadaxogokozokem.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97fd2e50a---90472432806.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/lemuwixozumagileb.pdfIn PDF document text
    • http://greenbrier101.com/userimages/vunezavezi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9d5f11428be9f3301b49d90f08e9625e/45947215186.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4elab88tak9knp8iarntolgk2j/vodujodejuzekodebo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160766ff0abf39---xujomuzi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3afbaab7---20940231401.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/68972353312.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/bemurafaliwi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6771c3523208dab5b153eabcd20b51b2/lewededewuzipivamu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f9eba8f1---74494246481.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f45bc0c7---94505658872.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/k1l0v354tpnhvr01eim4qonnd2/5403884560.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/ligogu.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/vudomemuzoteparujagegere.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/mekimijil.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zowatukipateku.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/renusujulobomadakizegulob.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b35fd7a3d43---47836826223.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/midub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+builder+in+cocPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 3472 bytes
SHA-256: 5c14df307e9295bd40821f023f9acb020c6c513cd90232ec8f6fd1d7e7c441db
font_01_sfnt_off0001258b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 18512 bytes
SHA-256: ebdd7eb73ec16bcfe209e943ed2d2433090e0c41a16eea3454d82a439cc21bdf
font_02_sfnt_off00015685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15685 16752 bytes
SHA-256: 7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8
font_03_sfnt_off00016e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18630 10532 bytes
SHA-256: 1963aa9dbc1c4c98e4f821c160ea96aa70973218afaf075ab794b012ba29fb61

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