Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17db8c88c756091…

MALICIOUS

PDF

74.5 KB Created: 2021-09-26 22:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d5645fe3f67b3aebf88a8bf7b8d784d SHA-1: a3126e4f2999bd7e6e4d4ddff8671dc3dd673d25 SHA-256: e17db8c88c7560916006c70269ea224717c7b9523a263fc8c0fba0a57ec7c8d7
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://francescasciortino.it/userfiles/files/wekujesejozugopabub.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a01f9f17b6---71393861814.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161409338d6643---83852444280.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/98892653511.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/pejofurubimase.pdfIn PDF document text
    • http://ewtch.com/upload/files/kekixejaxebogigij.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/23582889137.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/71682608332.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/letitupitu.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/65258852704.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/tuwikumiluna.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210906124326_7uw820.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/55009825434.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3006fa81c78e288a2a7e97956ad5e599/3601712762.pdfIn PDF document text
    • https://binhvi.com/upload/files/63393632593.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210923123145365216t3ett.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/konoxotubutuvasof.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///vadunewoxi.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/13283718191.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/rovekuz.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vasatitezesumezenabe.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/nuxuwar.pdfIn PDF document text
    • http://polipack.ru/content/file/63385780605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=iphone+gta+5+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_off0000bda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA7 18308 bytes
SHA-256: 8c32d4babf2044122899458a6419c633dc75d8e9f93f52119c223ce2ee205594
font_01_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 10480 bytes
SHA-256: 4f1218e0dc8fcb9c3d8115456c0f30fb9ed3d1f8a97ed1961bc86831298eb11a