Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a5667cbaeef494…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 03:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7cb880848854d69b8deb05eaa567794 SHA-1: 9d292cc51f403562f0a7b4f96049c7f3663e7f5f SHA-256: a1a5667cbaeef49419686a428e620f1c543fba408b6d6c2f23d60129d905a603
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary lure appears to be a fake download for 'gta vice city game obb file', indicating a social engineering tactic to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=gta+vice+city+game+obb+file PDF link annotation
    • https://inprovitbrasil.com/ckfinder/userfiles/files/gigonawu.pdfIn PDF document text
    • http://malifer.hu/upload/file/xopesivupimulududusixunuf.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/lifufizizubazaduxuk.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/wetuvimisusuros.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/lozesuwekokojejag.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tewajuzuxafakareke.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/27139827075.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/vunutamasivukivizan.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/14099807926.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/59951217559.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/13055024450.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364f97b8f54---82203047476.pdfIn PDF document text
    • http://safetruck.gr/images/file/74188167790.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/92236788659.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/67782108881.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/96021323595.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/tukutipamovi.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/doxajikevezexojupujagu.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/nasowokupakimaxigew.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/70811182102.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137357755963---33215319882.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1d44f3632d89b0ab6c76a4347ed7ddc6/13045061489.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd493b669---80456556429.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/kinaletolukilopiluzom.pdfIn PDF document text
    • https://okazionche.com/files/59277974997.pdfIn PDF document text
    • https://jin-ji.com/upload/files/78352740741.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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 10668 bytes
SHA-256: b3d069b572daa595743383928bcdc09f7cd1ffb1fb84f312b7d2b0558535ba47
font_01_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 17004 bytes
SHA-256: 2470b996ebb91e29e4315207ed0fc51862b40e61f54cdc877bb8cefb0aaf2cdd
font_02_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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