Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f88bbc19eda6ac5…

MALICIOUS

PDF

100.9 KB Created: 2021-08-09 08:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c51f42005b602e9e3e533d44220959c8 SHA-1: b4df2899b925af8d7933124b0ddb9f760d886d32 SHA-256: 0f88bbc19eda6ac5a4b4a45542e9940d62c15aa588aeaadf1cf977a81bc69b3e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=questionnaire+lecture+kamo+l+agence+babel PDF link annotation
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/lulugisuwasarezul.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160990b57c4592---61395987569.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/zevekimuvojidazaropile.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/vowejutafilojomimumo.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/13251293313.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4f71f3c8---sirevomulipokoremodalap.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/buxebakevokirogudamanive.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff469b1e4---98890884629.pdfIn PDF document text
    • http://centronegozi.com/public/898450071.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b4d59f4d---xutifuvikoxajazeranen.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/78823322850.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/30616338375.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447a5080c6---wosijus.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/xupenalabitedupuwedo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d404e1644c---35583931387.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d613ef94c---zokatet.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160938ca716f13---jamepojafigitu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a40d3b9d0---26897543174.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lopidimupuk.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/sobobiboxujukavewiw.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/xanox.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812782bdf22---sulikiwizetigisogelakemix.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d6134e78b---gewodatafexilinejedutip.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_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 21400 bytes
SHA-256: 49864ed6163c677aa870d953e441f2daade4609f7b8625233e3c68f11dec6e00
font_01_sfnt_off00015223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15223 10964 bytes
SHA-256: 68f0b5cff38d64481d03bf3ccec6ef10b23a5cced9b68e8e2f518db3d9ab231e
font_02_sfnt_off00016bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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