Malicious PDF — malware analysis report

Static analysis result for SHA-256 23450b760aa0d8a9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 21:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f357511b2845a7929fb104e0803b5f24 SHA-1: 21a73259a8ff5bd4dfeff9c3e45ba2c375a12c0d SHA-256: 23450b760aa0d8a9b58120be528f42e1b72d9be41e20a9bcccfc05b769a0288d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, particularly http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce45bbed23---71837386184.pdf, are likely used to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce45bbed23---71837386184.pdf In PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/tazulopigaxodujakipuj.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/51370729822.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/73281109633.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/67149888981.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/resaxepefakomewolimikik.pdfIn PDF document text
    • https://forssh.com/userfiles/file/40845199236.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/dokenivibobufijosaguvos.pdfIn PDF document text
    • http://specialcats.nl/media/files/71728823409.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/bidajugomirela.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/61691457170.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/tevuzubatizi.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/904849100.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/11258931843.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/mokigikivu.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/satexadejajexuresukowig.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/23255204488.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/83564147053.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/60053093001.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/40130410148.pdfIn PDF document text
    • http://kvrhousing.com/uploads/29824862248.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/14613927449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+aosp+phonePDF 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_off0000b1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 15428 bytes
SHA-256: 99bbb0f27c7a6a4354a494ed6e7909186de523882d4ad89723073f3479e8372b
font_01_sfnt_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 10164 bytes
SHA-256: 612351a98af73b3bdcbb40ba225e2584e8d27e0c9ced92449f5514076e77868c

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