Malicious PDF — malware analysis report

Static analysis result for SHA-256 832f5dead412be39…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 21:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5bd19cde43d1da71d286346980d2ce8 SHA-1: 1b298524ee01b35c445325f0f580cae616cee0f7 SHA-256: 832f5dead412be3979dfc21c4b3e2418cb2fdb589bb755e45e7cb5d79d4c205f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The presence of external URIs and the overall structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://arslanemlak.com/E/file/ In PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/zofebixuzufotepekagom.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/sekonofuga.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d2b335b0afce499c12b99dc29ca72e94/40002219293.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614617ecb62c6---mosutadomuxirelajaj.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/mefifupefajisoxixuson.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/reber.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/vogunewuduzozututirizelo.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/78879952029.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109091436323800.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/xatimudogezukulemike.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4bffc00d2---66036728860.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/dirad.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/zudavajajimajun.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8cfcbf52d59de9a38426f2b7f6cb21a5/58229684996.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/wejasani.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/71496715740.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/kijajepomumobimis.pdfIn PDF document text
    • http://gestioniarmatoriali.it/1843378733.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/lavusutofexeb.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/78744680733.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/tuwopivaronumub.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/25113294444.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/57391891190.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/73282266232.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/nejobitofadiwovivapizak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+instagram+downloader+for+iphonePDF 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_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 16596 bytes
SHA-256: c6e1f833aa7b5a62221ca302edc5217a2832e2edce5d1d91716e47b04c781ffc
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 11084 bytes
SHA-256: 719b915179d2d6b076c887962f5437bc331576d292a50b1412a21495b17bb05c
font_02_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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