Malicious PDF — malware analysis report

Static analysis result for SHA-256 9598c41aa85e4a29…

MALICIOUS

PDF

81.2 KB Created: 2021-08-23 12:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 56ad9c99c14dcd7881747f98ec98a3f5 SHA-1: 57f74b0f0311e88eb79ee4b9dc57e9b1a9adf8b5 SHA-256: 9598c41aa85e4a2903ae320fe5ff87f11c408d029ef02b2910fa35c01872ca65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it's part of a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://archism.ru/uplcv?utm_term=nonparametric+statistical+methods+using+r PDF link annotation
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/8929236580.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/vutijosarojonud.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/vejevepujokop.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/44056567597.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/sudode.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69ad7a6e11---dinoki.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/23212490294.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839790eb84---45803321192.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc1396f7b2---sefejita.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e717cffbea884342cb0dea08c2c39f29/8770066029.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/87258459629.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/30403170314.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/gunebogibu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/e0282qsi4dblnq5j5rldvfq8kv/16332558925.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/rurixifenapifumawesu.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/92673862725.pdfIn PDF document text
    • https://diphong.com/uploads/41201038193.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/23782645622.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8b988da5d6e451c84def976f58ec33ce/22704981066.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ffdc4029e---vakolubazitufub.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/72b6ee30abb6361cc716b9f8b9fd249c/sazogumijap.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e796175e72c---55575812430.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7c5b63e1340dccdc3f5db030909896be/52474547928.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091042f6272b---fewozeru.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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 16968 bytes
SHA-256: 1d12a329036b36999018a4f458ab714f4408b374e2ad9527a6f5da9a9fca1d8c
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 11036 bytes
SHA-256: cf3d6ed8d620ee57e275086855e5bfa284e50200b62f4510595951f7fc406780

Open this report in the interactive analyzer, or submit your own file for analysis.