Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b8e69ddbb8ec4e…

MALICIOUS

PDF

108.1 KB Created: 2021-09-15 13:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 508e88260cc78157ffa406374c077095 SHA-1: 8096ce62d12cfdb0367db96955822e5860c24fb0 SHA-256: b0b8e69ddbb8ec4eb18a419f2c15a65722de6e416b3a00df234f7aa3c4efd598
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a link farm designed for SEO manipulation, likely to host phishing content or malware. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of multiple external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=examenes+bimestrales+de+telesecundaria+pdf PDF link annotation
    • http://studiogiovannone.com/userfiles/files/19352021532.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/gulinuvipow.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/18284960827.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/52392200616.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6cdca8c01---5223723237.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tilulotibefumibajul.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/fejasus.pdfPDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a944bd0453---39043071207.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e3e45e0a---watudifemaforafifatino.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/69180807404.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zuzametalapunosiwapexobi.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/53981114109.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/susijemakafo.pdfIn PDF document text
    • http://skncn.com/u/files/donowopidozipenofibu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e31883722c8ac19d4ba9416cb9e22388/16146923217.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/77865442638.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xoboxopexesuwalojageliz.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631303171.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/40756240936.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/64408416295.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/69634454136.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/74582603239.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/63314161047.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613904dfe511b---birixowu.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/piguwolamopaj.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_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 21744 bytes
SHA-256: 9382d6972813d6e898714ff0f088642307f20929ab607c8d1862ffa4e892ae20
font_01_sfnt_off000170d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000188eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188EB 10984 bytes
SHA-256: 5b3e652a9539f51fef3bb597a483572a7713fdf79803c87376d63cb6ef1ac4e9

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