Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3d9d86a9d9438d…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 09:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6a6e936f2e43a690f46c4884ac2c44ea SHA-1: b1b578a0cd9f585d036ccb3960dcf9827a05b2d5 SHA-256: 9b3d9d86a9d9438d236587e3ce5a1e192885afbc12aa43d31090bd7fb0209d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=mp4+download+music PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607443f865b0f---noreno.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/pejunutitefagum.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6f88d26b136ce6207f4a6929f5a37d14/60328990569.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f2648add4a1ae8fca6eedd4e5b57e7ca/36677283217.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/4i4omalsv2b743idpp2iibh8ph/45529994889.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/mupukeli.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/sakanepisu.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofakufazugagil.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/84ce91af55673daf1bdbd0f377b13ec3/30054500101.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210610043345.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/hsst0i0n76ivf5e1c2rraqvuh0/subusaxuranen.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/livatalazepad.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/3858148346.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/05/68029346804.pdfIn PDF document text
    • http://citra.cl/userfiles/file/fodomapumuw.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd3b17e16---76417894840.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920b694a2f8---74050827603.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/87abdd1af4906f7e8bc3aedfc8f0ff71/tifilipivevawitiv.pdfIn PDF document text
    • https://vestol.bg/files/file/86504435994.pdfIn PDF document text
    • http://thaide.org/userfiles/file/20056473173.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/5c346a059deae26f015e8f15d97eee33/finuxuboki.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6532b4a82f---xevenisix.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f127491895d111d7badafe5d70d48510/kimurefavubika.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/timalura.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_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 10604 bytes
SHA-256: 74ddd316bef5a7ed6a0e213b2b4d27f4b762932d0dbb7aab6b5065e54f8b9718
font_01_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 16744 bytes
SHA-256: d07ecf830b8a508b7a2cc825d85598e09553a57ba8ad925c1fe3a91df0f35fb5

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