Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a33241fdac909a…

MALICIOUS

PDF

100.0 KB Created: 2021-08-24 20:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12129271d30e3599d04ba748a1b1151c SHA-1: a0c2c8745b0483bd86ee553395669749940fae5a SHA-256: 78a33241fdac909a290b06fc2f4337407cca433141ff2995d837bdff95d7c11b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, likely intended to host phishing content or malware. The PDF structure itself is heavily obfuscated, and while no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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 https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/gilisubabotetejufubow.pdf In PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c669969a818b8fab4c48bc9b067c5311/72204717895.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/62554809350.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/72694270195.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/xowigazesatinakapov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7af7000f76---62864438031.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/fnh6tgfihue8ldjnhu5vlf22so/70397594817.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091a2b15769c---86356321427.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/19278379032.pdfIn PDF document text
    • https://okazionche.com/files/piwabotavabuxelaniv.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mevexevewugoravadejisoz.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/rrfhiq0mfte0qsk419bojrvjp3/wizuwulipavilalevujenovo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161009288988f1---30114252226.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/244d93e9a5934fbae4a55446202d1a82/juzidagugomok.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/47793062970.pdfIn PDF document text
    • http://citra.cl/userfiles/file/pevovalul.pdfIn PDF document text
    • https://yuss.it/file/razekedazividanejer.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/48235881261.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/8811373371.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210725_54C0344B4295B92B.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/96359068531a8f9d03273fe574ac666b/fagerobazapixari.pdfIn PDF document text
    • https://eetravel.net/file/73213854943.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7d96907b9882d5c4d26fddfe61fdf5f/rujevetorolulitatatip.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/sufinokipiwoludofewilite.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/95216369438.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/26883159545.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/45818575942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=deliver+a+speech+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013423.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13423 29516 bytes
SHA-256: 1de08b77b965038f440053323ca0483ba3df3ffec92dfbf541d719f971f4fd79
font_00_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 16492 bytes
SHA-256: 654ce24cd56758900157cf8d0a8b2a58a0acf6fb1f91f7a82e52c07af35a3fe9
font_01_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 10672 bytes
SHA-256: 2d6dce275e48e83b52cbf677f60fa85d3866f94bca917eb375f579140ef7e825
font_03_sfnt_off00016991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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