Malicious PDF — malware analysis report

Static analysis result for SHA-256 927f66d39723cde7…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 18:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e8d9b0c66b2c1fe4ec902516ce78150 SHA-1: 30c86ab2e8c6fba6b04bac6e111c65fa489492ed SHA-256: 927f66d39723cde7e179ceb92170946d945c3bee4199a4650899990eed386e68
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://archism.ru/uplcv?utm_term=veer+zaara+movie+download+for+mobile+hd PDF link annotation
    • https://cakenflowersonline.com/userfiles/file/63709643796.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/wedibetejutafamavimajerat.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/48485652723.pdfIn PDF document text
    • https://pcetravel.com/files/file/vosifamorunikororesu.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/63691365618.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/fobevukaw.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/nenalisatixewimavud.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o3t67634rrvfutf51ch82hp2kh/2742123901.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/sewutiwilozalunekemizubu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/vojanipa.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jizijojumofogixa.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83373337483.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7df306bd---44402946766.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/momirozokizonasavo.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/93449377315.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rp9cucsn8mlqka2gumlp6cnt4c/34093531085.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161414ca09d458---nesedofiritufakudebinapa.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/72360428799.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3b6abfcdd83cddfed62f0aaf1863fa5c/xivalotaguwegimet.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/pakuwesumuxeb.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/soniwigabiba.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/mifepesagisaw.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/vamesidepi.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/16161021854.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e123e4dd3b---22185728597.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/31675471271.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3minv7j38sj7vfnvr0keq7vq5l/tusew.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tm9uohe371l47jodurcpj85i06/17102483630.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_off0000b8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CB 16320 bytes
SHA-256: 292240cd9eda5259e9c6cfbe608ea46169c61b300f08b36981645dbaa6979f03
font_01_sfnt_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 10676 bytes
SHA-256: a1030cb0339992ba02e623c0a4b406ab7a7dc88cf3190df5c78bd1c42c5bf9aa

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