Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9a52159b9ca586…

MALICIOUS

PDF

120.3 KB Created: 2021-09-07 11:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab35c442ef93d1b62898e10e61a42f62 SHA-1: 628dc3f792d154b1f6c269a4d7f7989c829fbe37 SHA-256: 7a9a52159b9ca586d44b0ea078c68eb61b3184b6189b455947e077a61bc26f0f
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 as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to external, potentially compromised, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=american+continent+map+pdf PDF link annotation
    • https://swagath.co/new/ckfinder/userfiles/files/fewebenowepifefawoso.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee5498b14---bavofudakuvor.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/95416645487.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/tulixanokuvodawofopuxibub.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/403c11e2b3090fc03b089808d4a457e2/tatoxuwipolokarakoridevi.pdfIn PDF document text
    • http://industrialdevices.in/uploads/25946364998.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079758722ef2---sudemesijizuvojuz.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/4f7d1b72f0680a55a0a9a7be885f7bca/53837525393.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/2898517025.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/gesakipa.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/fujipofu.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/vojibafa.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec093f4b6---6333759865.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/31660666665.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0ef0f903befdf34ee3f12ab8a132227a/26965201524.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/lelub.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/18770ab53f1b9d5fd09105eb1cd82ae3/bitatude.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ghumbjmbprfjg48crq25463uod/91237856861.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/a43n0aq0l10k677qva1maeqgch/giwun.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/vikasupajalapekotuguwifu.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/21622662190.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb45999642c---zenekebejemamaxeguv.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d7ab208f---33718340205.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/96385737873.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_off00016c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C39 20992 bytes
SHA-256: 4b2c5b5207fa4a3976d003e1f2dce7599d682a51c03c8098f015f1cc23f19590
font_01_sfnt_off0001a357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB6E 10548 bytes
SHA-256: 9096f25ed83ed50848157281fe2cacabe3e21cf13ed02cf77325be161fb49339

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