Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89bd176c4b26051…

MALICIOUS

PDF

126.3 KB Created: 2021-08-12 10:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f5e06aa8e17b74047dc9a49e776db2a SHA-1: 59a03377eb324983d313e9c8b290177ebf370e38 SHA-256: d89bd176c4b26051c2b64460e52ab339999068bf7d65466e6e0510a8ea4208eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764cd9ced37---5500403825.pdf In PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/28557072151.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zejebowodolape.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/24680a2cdc39ce2eddab0b41cd15e2be/sovefowine.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/dekazonududelijub.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/woxugetofafakotalasexi.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd2904fd3---75251339064.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f406cd604ed---50740310069.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d55b6ae7c1---lirupisado.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kodukulipisal.pdfIn PDF document text
    • http://arablift.net/userfiles/file/16740145489.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/b42jl5egojqivbp09bhmviic15/tulazogekilisaxojepa.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/mevakipozugijafowex.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/5001811053.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce511aac59---zafimijewa.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/54022729600.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e818f61fbe51f606d6365f3e3eb59e2d/94242115718.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/17548700612.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/74069714749.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21860e6679---tukafigiretuwokafu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3706958a---24878717208.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a32c5e410550a1f54ce10d8544f33fcd/32074241848.pdfIn PDF document text
    • http://ailizia.com/userfiles/dedoranotib.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/95703700910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+phenomenology+research+design+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001895d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1895D 11176 bytes
SHA-256: cef003c0527579d7ac17135e45efdd6a7183fa4d9f107ffdb54259634b2f046a
font_01_sfnt_off0001a324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB36 18632 bytes
SHA-256: 9248e07a35078ed7cc113c36f7dbb7493060393298a562d2de533695810590ad

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