Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea84e59c585c40a8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 02:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5931a7f30ea8451d5cdab31064119bbc SHA-1: 22f4bbd22d8bba7379bb199f3b587514116fdaf2 SHA-256: ea84e59c585c40a85c632965d229f865a62b2ec20824922758ae02cec90ce80c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' in one URL suggest a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://chcial.ru/uplcv?utm_term=can+you+check+wifi+password+on+android PDF link annotation
    • http://mcutech.net/upload/2021/09/file/1630713502325094450.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/56957891097.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wonobuk.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/59627788746.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/63122313729.pdfIn PDF document text
    • http://parateam.cz/file/43669592981.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bed1eb3724605a1c3cc85c1ab9de251b/3640493802.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f5c035b6---paxokegedisabagavorutib.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/50504905528.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/wafuzimaxuzovibiwivir.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/vovulolinolosarevexapaz.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a096df85a---tikufapupe.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/nimativi.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/73733695541.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/5443851501.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/85867318659.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/1072414458.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109020355322733.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/25476234752.pdfIn PDF document text
    • http://cochemical.com/upload/files/94320131529.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/35566084101.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/sg50cfc8snu1t8celiadvqaff6/zawevivavarazomesojexuveb.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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 17860 bytes
SHA-256: 49f0c311023aa7d64863b8fc27c61e73dda16c55e1bd716462f1615ba3f405ac
font_02_sfnt_off0001202e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 10996 bytes
SHA-256: 7e303d87089c50971421da512d19f700ed3895df6ff2372b614f93b9b9a1f207

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