Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab45e95ab0ac278…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 15:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cc6f75e5fdd4cc37e24d7185fa8d644 SHA-1: 2f0014c4613684c6b2cc2b60f38a7f98479aa077 SHA-256: 3ab45e95ab0ac278b3e3950ece18cdec05cbd9e709a80be1a20682b9dc03d420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the URLs and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://inwebjor.ru/uplcv?utm_term=feel+light+headed+after+eating PDF link annotation
    • http://gs-metals.com/filespath/files/20210905185954.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/34546754155.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/3622886743.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab443a5a0---zemesazorelirivolosa.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/87526983377.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/watowebixunadapizanosel.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/72491906012.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/roxewitubelowawebekom.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/xabenuwurolibamosurila.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/xawerugavukik.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/50407112538.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/sepun.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933a8870a9---fopiredolurezu.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/27935450825.pdfIn PDF document text
    • http://jiab.net/userData/board/file/newijegizaxogu.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/xuzezomekoxixevosumi.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210908_90F07BD30604C957.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/takike.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/36173534141.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/39ec37b38c7fb675a7a50437b1ac5644/xonidevevuvem.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/90332375244.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b6d25e1734---zetimizowogasek.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bb5ac0be9404fecfe6cb8f437238fa85/navudinu.pdfIn PDF document text
    • http://inercial.es/uploads/files/tasapoderusevavodopexewa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ab233bd39bb585ad732a55caa538ce19/62726801833.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/42313313318.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_off0000b7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 14808 bytes
SHA-256: baf5c60e1c999b75722ab22bf515f10a58125a8238d89e9cc9d059f6d7b53b5e
font_02_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10324 bytes
SHA-256: 20fdcc53d6fed116f388870dc19abdff2db7d2e0179b0877ceae40828dc14d7d

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