Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f89d53dd543b4f…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 03:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27782562499d6261d3770591afc0495a SHA-1: 9dd594a8210db52ae803863b2c1b6773bd3d9208 SHA-256: d1f89d53dd543b4f911e919b3e29046f6846c1df21fa4e7ba2e8fad1105ae662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. The presence of numerous external URIs and the link farm structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=love+is+like+a+ball+and+chain PDF link annotation
    • https://artlabjo.com/userfiles/file/33189077239.pdfIn PDF document text
    • https://guijek.com/userfiles/file/66049130644.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/37f1cc9c9b709b995998220b004133a6/83860208832.pdfIn PDF document text
    • https://fallsplat.se/file/jazujabo.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/sidifutewifukaxa.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/50a9382b48db98fc2d6e8af6b1986b44/39531610188.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/39fd9a4e4cc50bedbe09ec0276be307e/30636881386.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ac81961e---ranugibudewonero.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd6fbda813---subenulepug.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5dce8da4---982121847.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/pumobas.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e45d62cf---zixukipak.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d2c0d231aaf1aedaa31ee04b127d6d2d/49030167019.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/jinitijemonixewafif.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/36233849257.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b491fe859ea---80871635266.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3123c0fdeec4c67107afb5867a6aa360/86369897139.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/03440c46d786ea6d6dc51f6f3630ec7c/kediweparopadolifal.pdfIn PDF document text
    • https://castel.ro/userfiles/file/4066673385.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/31011092984.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d5eead3fe9a47bad17b5395ec8ed04b7/borigupit.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71021bd1f2---xagovovekatoseguzobagur.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4b030f8e208a2d3eda36adef6528646f/subazumimekamaz.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d63993c14---47373222816.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/27755035051.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_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 19720 bytes
SHA-256: c821fe6942fc8ebbf17edb03e8151d5c85a521c5b270609c8ec727432e5f8595
font_02_sfnt_off00014020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14020 10524 bytes
SHA-256: 63d1080ef17f13166bf924e5df611827bf30dfbe935d3c122980f137aff9fe33

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