Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd98445c85d31d58…

MALICIOUS

PDF

89.4 KB Created: 2021-09-03 14:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad1077aa96accd220dceef88fcac80fd SHA-1: 3b4bdbf574db4d9320455887fea4bd42c2d49888 SHA-256: dd98445c85d31d5813b4c359ae1cacdca7c6ccb85a02e3c96397a6d9808b86bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=essential+mathematics+for+economics+and+business+pdf+download PDF link annotation
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9150930e---gutiwifoban.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/xogutekarasadozufatiroti.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e729ecf171---wujedodoxipodukefilisel.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/a7vjshrlo3bdvihdf9gleqtbk1/gomakexutizuwesinevo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce19bc65c---domewabufarizanadales.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160776564c0369---fulisobujut.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096a2098dab0---8337578910.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210607175132.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/44334828873.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8e2d1b787---78173463483.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210820141200.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c991b0bc43b---54144680135.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/57500187479.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076586a15f6e---12049792393.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5a6a118cd4e81c076fb30bf3fdd5f97a/jawalimiruroruwobixukoge.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tetonazituxatun.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/zividoxu.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/2617810004.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/77898092332.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/91320566123.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/banosid.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7ip59u3dtrhldc0s5l765mtr10/99599530199.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/15319290857.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_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 20800 bytes
SHA-256: e18487c48433a00679ae91f6f650f10837d994d3fc8142edfa53c4ee05ef1012
font_01_sfnt_off00012578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8F 11192 bytes
SHA-256: c35eb3cf46f9800f93cc567cd8ce68fcbe9e25c29c4d9b3d1ba86b7b9155f826

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