Malicious PDF — malware analysis report

Static analysis result for SHA-256 5584e756b85abe0f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 23:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 553172e403f5130e1331f749bd5bc79a SHA-1: b77499cc9f67ae6f27a6528490c9c16e1cccc2ce SHA-256: 5584e756b85abe0fa32abc3f7d79c7e9425f0ef8fe7cf7a17afe1f610df11478
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as a lure to download further malicious payloads, consistent with phishing or credential theft campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chingyi.tw/userfiles/files/sunoxukavifor.pdf In PDF document text
    • http://uptownherndon.com/uploads/files/tusetudajolofojozijud.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/rapokepirafagekil.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/sulevebagabozijuvuzi.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/11416305758.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/28for2gdsggrsjccdsuo1ldtuf/71213442976.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/93768949088.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/fimezemufulafe.pdfIn PDF document text
    • https://maisonforville.be/documents/file/6474802969.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80845137531.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2f55e3c7c4378675d79779800c37d2b7/55007171671.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/mufibajodoxagikusuzipapam.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/44822315327.pdfIn PDF document text
    • http://farashimirooz.com/files/fulumagegifa.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/mofekeferusudip.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/39148173208.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304f6f0b97---pakifusubivokupetezema.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/39031729842.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/fesagekamiginevuxaje.pdfIn PDF document text
    • https://euchebnici.com/img/file/nitivoxopofan.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/15961751502.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/lojenovinukorixurefodibu.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/zusepopanoralemebivuvuse.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134356278cb2---tunikuvufirebunoxiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sound+assistant+apk+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 10504 bytes
SHA-256: 63e52a0246a9f5c6c6c31f942e8f9a4b762a2b30c0e67f2a97c4d093eda6f326
font_02_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 15992 bytes
SHA-256: f2e89bc02bdbac41256bc4c84235aa00fa86f5a7d2e02e136f93884934e6c81d

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