Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f56363966aca2cf…

MALICIOUS

PDF

81.4 KB Created: 2021-07-18 22:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e66d67aaf5b074fe8c3722316042f623 SHA-1: e4a8299f803413382a6276e875c3b5338acb7b41 SHA-256: 9f56363966aca2cfe1251b1c5afac2938cf937138596f19a0c593c22530807c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ad028fe0514b7b4c17f5818117b5c890/32019207539.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075b08eab2d6---dilowexojanogijumisijenud.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ghapbhktmcr20ie5768hh9i1ra/gojupibepusil.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7a3f0d3c198971be9fb5931ff31df016/pusonorizazofefoxet.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/1cd887a2cc976edbd4ca6ebe4832108e/68438933607.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160889f0ce8067---furavevimipetenerewal.pdfIn PDF document text
    • http://hkacca.com/userfiles/52797664616.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/ridibivowegigomirex.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/41786863856.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/ruwasufoguforif.pdfIn PDF document text
    • http://isgsrl.it/images/file/bemus.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e3bce56e---19157779741.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/31740742311.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/dizogap.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff839125d---lunitidexupovibez.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lmk73iv9p4in5t1o7r01tpscpj/jegamote.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ec33d00b---wumebojunekalutefunak.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/risoluzatufodovabeperadi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07b69c65b30af0cc391739172434e0aa/rokewurarenemexoroferife.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/firininirojexelovel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=clean+period+blood+from+mattressPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 15972 bytes
SHA-256: 890d2ed3c2c58077da3fd83806fd472df287550cb7aa90fd8cf0afb2aa34a27f
font_01_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 10828 bytes
SHA-256: 97e9ba493164d6915a3c370a8906aa65ec6eed4e064e7d7eaee37df8479ec7de

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