Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa9e01c2d2879c3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 08:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 837f722fc836c4f39aed2b11e61d316a SHA-1: 51120e3e19e89af34158fbf0adac2681e9843847 SHA-256: 5aa9e01c2d2879c3ee33fdcf42350d276b9af21cfb5c9a6357ce50a38c42561e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript, though not directly executed in this static analysis, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89f641bdc---narukukeniwolotova.pdf In PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210823_736D3CB00A7617CE.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5d53b1ed19135eb6f03d85eea2c7c0c0/32647818884.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/baxifupin.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/jizilunasibodututiwo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4df94a88---83337547005.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f6f541830a88e507e5d4e43eb42f2ae5/91667209655.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/titalegawusirepexiteje.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/nufoladinepotum.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fuwikapizaz.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/jinazalopofisenir.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/165242cc3b8fa2b931604ae1cae9e705/jirebofanoropaki.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/tigawesoxujebirozajobakaj.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a05e0e817---juximibu.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tapoxad.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-18/20210618182428545041.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/80922017154.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/88a6da45ec77adacc128d5311f1a6818/waziw.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abca672985d---82003998004.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7b0344f6---mudonoriwowebakuzud.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/6b6c89645d5fcce3acc7b8f401758551/6095102975.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68377476129.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/xitegadif.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097e06a2b709---72665319109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=abetment+meaning+in+bengaliPDF 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_off0000cecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 19916 bytes
SHA-256: 0abfb7a5752b65ca0399bacaf9f28515ecc6bae9cc2bb96caf27105d51692bb1
font_01_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 10184 bytes
SHA-256: b3909cdf1769648198908a2585ad198bfd18b8073fefc73b7063e7c076d8f6fe
font_02_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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