Malicious PDF — malware analysis report

Static analysis result for SHA-256 1603fa1b7b8cd155…

MALICIOUS

PDF

81.6 KB Created: 2021-08-25 17:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d72289d8b0eab8befddc1149e156124 SHA-1: ed15422e71615f40c47fdb15526be0b322074fc2 SHA-256: 1603fa1b7b8cd15519df1ac6edc17bad0f61acfbd63746cd52d92485b6054f1a
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 CMS upload storage. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/uplcv?utm_term=funny+dog+quotes
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/m23pjr8ak6kblg9qntaftj924d/vuxag.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10846ade2---78607878108.pdf
    • http://unseretochter.com/images/file/60284651562.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/6829810281.pdf
    • https://pbchistoryonline.org/uploads/file/28109758165.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60d13bd42---15589711021.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092748ce3e6a---kunawiruremuvegamutet.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/75736742138.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac795710c---nogedisidikazuvim.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2333430f---xerivobibivapaxenevij.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eb45a2aac---vedilemuzovulos.pdf
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/82888077415.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/14e800db7dcae01ab650421e0e4b886a/dawitigaf.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161082656b2bc8---33723800491.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/74813481121.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/v6ce93l96bc5vai7rsj5sruoi8/nifuperasukapalosa.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/caa23261767be70afb87b692abcd41c9/kamixibegilabesugiwa.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/sasizenidisesudusoxufij.pdf
    • https://eslms.com/userfiles/file/penisexinenubi.pdf
    • http://diacritic.org/travel/app/webroot/img/files/detixefabixa.pdf
    • https://klairtransport.com/uploads/files/nodavujoj.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d2313896ff6---notonoluw.pdf
    • http://steakclubhn.com/campannas/file/fifegipaxe.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f2bc812cb---62095350872.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfc.bin
9c7537d4da840799888c947d043c795cea55ab833c61bc7c906bd8a82fbf1e2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 10360 bytes
font_01_sfnt_off0000f407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16792 bytes
font_02_sfnt_off00010c19.bin
e9e9503b0bf68d1cf286aeb2cf7a7ae01b5bb53efe24cde3803cb72edfd319aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 17016 bytes