Malicious PDF — malware analysis report

Static analysis result for SHA-256 41250c2cb5d2fbb5…

MALICIOUS

PDF

92.6 KB Created: 2021-07-03 11:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cd3e49ce364786bcdc346eb3c4bddc3e SHA-1: fb7dcf7257d9487824861fb05cf3e513675d9a47 SHA-256: 41250c2cb5d2fbb5163870d6c4faf65faa9c70403e9e09255a8ffb5ae17d3c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/uplcv?utm_term=ipod+classic+lossless PDF link annotation
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddecc100af---2038609794.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c950d100ce---ruriribuvumelimagufu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4ma9uk9utevv2l1lknna1hmp56/junudarub.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8901cdce1---netisetatutarab.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2of0s8neo230b2gum6s6b2dgfs/87374676600.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/97e7247d04e5bdb5d6c7c183ccba7801/xojerov.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/t14rs6iupgm8ee9rgae8plmdk2/zufutetogamupizej.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/87fd624e869c531024f754a622047387/98588672141.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fa9b199cafa972821423c72e8e92fb9f/wegiwoboroxakelifixo.pdfIn PDF document text
    • http://vinmexindia.com/uploads/vumatuxorekavezali.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210609052146.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ac747eaa0b5d8b84343d3281e428867a/pozasoluwiwemaxibelebebu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ed825e0602b30fd8ac45d386311d07c0/viwabewabonud.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe6d815ad---91461417054.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/82448823353.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/41c2060012db877f42918d7517930e7c/40994384771.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bc10cef2---25959751209.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0379be4b29---65092906569.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/75396572509.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d5305369---56883245190.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f1423a510a53cce992168a77bf366aa3/nonamoragawugezuxugoza.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b242b8c8d91---povetosuturomi.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_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 19760 bytes
SHA-256: 0ed68f2e27da58dced78ae4ca057c87f2d96f8fded97a46833554f7658d54368
font_01_sfnt_off0001364d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364D 10156 bytes
SHA-256: bdebfabb17bcf967c31fdc0a49f9bfad1cc0887f38618477e70777e21aeb38dd
font_02_sfnt_off00014d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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