Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e77a7ad3f8a695…

MALICIOUS

PDF

63.8 KB Created: 2021-06-24 05:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7119058294b50d35fd6b62494afb2076 SHA-1: 4c8e8223bbb046185904c6520ca731ff1358c916 SHA-256: f4e77a7ad3f8a695f7f09ffe7a9ad53259d2065b3b969aed3388377662d57234
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the overall heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a028fb3e9e9---36526962291.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rfu5l3f83miv59vth5347ibhl4/30213720799.pdf
    • http://icmasistemas.com/userfiles/files/fefawivus.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b64165816---maxifigunorumo.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce800868d7---jotuviditumurugiv.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609215d7d2b02---rebozitijefeduva.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/78bc316c306ab549ed9c3949d0118868/38528541095.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4e9f252dd3b743088cb6cc87ea800245/63786301264.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c67f551a1e---sitopisagegukawadapita.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8fe112453---23396929881.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1891a6284cab085f9a05525ff24e92e8/mobitodaxolog.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8025e569---lizovozegidopixuwone.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9a3957e5a7626b55b2e63c32888cd37e/46697335052.pdf
    • http://nessium.net/userfiles/file/divobekozejakod.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c91e26724---98647680802.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=suunto+t1c+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0a8.bin
db97a8d171c1c908e44d7455a89d19165da0ac258324b9833c67a2e4198d65d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A8 4824 bytes
font_01_sfnt_off0000d105.bin
af38095ce51988a67e0ebfd6fd33ae6101abcd48ece262c6a28fde4791637998		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 9772 bytes

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