Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05ba0084a5be310…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 01:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a8a2f937d64d7380b0abf27f6624d58 SHA-1: a9c016574f1169ba7722778bc18018a611c807fc SHA-256: d05ba0084a5be3100ea444f4662feb5acd9119caebd6ba0f3bc1125904cb5ede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous disposable hosting sites, a common tactic for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the PDF structure suggest the primary goal is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sanagustin.cl/files/47988725979.pdf In PDF document text
    • http://sunriverps.com/data/editor/file/kizojinopotixetizorufiwu.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/13167818816.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/romebodebosazigeboj.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/732f8e845c639db635dfb2b68fb9a8c2/46190746096.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b493107453c8c5ea3a9b7028cfe39a63/18504848692.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/70685467420.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba3cb30344---8179118824.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/64440518303.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/41770616911.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607891273ab37---53836428191.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de184e3b5c---sogakepibivasinemiboda.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9a6eca12d801f91871c7f773c18af3ea/kelamopurobinixagegoreme.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/kezoxof.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93f79b3680ac4df73f807f13a5dcba40/furugawetuno.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/nuxaxozo.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/tasalomulidij.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///25726672010.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/xavokabad.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0b978fca9---43000463886.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/261d3d146e27a90cd85a24eb2c0aa353/17526449205.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753a74b2b54---jawifesiziwiti.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/11479765436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=list+of+gram+positive+bacteria+and+their+diseases+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 18188 bytes
SHA-256: 238d47e4ae3ebbd3d92905bc89508f19bbab576dc2de3f4a8e392d09f03460c0
font_01_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 11184 bytes
SHA-256: ee4ae725ab7bc81b679319d92350226af1e1be9a2d97d64a60f0f07f328a9585
font_02_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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