Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c4eedb87b002eb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 00:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0dab29ec24ddb7b4266011551f94c98f SHA-1: 3b71723c03c4052b6371806d861c39ff4dec6bda SHA-256: 95c4eedb87b002eb25fdd8739aac2f9613e01870a8097cc6475554ee8454deb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333c7974f51---49094336485.pdf In PDF document text
    • https://siahotel.com/userfiles/files/36474636499.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/93558014179.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/33655094687.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/84207518768.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/jiwetuwedefum.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210904_043542.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/lirazakelapiv.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/29668356792.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wemofemodozize.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/mugozozaxexutuvas.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/dusuzelideto.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/49682134325.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/710fd08ac91e9a03fd9f667a833a4d45/55089792166.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xeperafokufaxujodelotu.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109130602058737.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/figipu.pdfIn PDF document text
    • https://reha.bg/content/upload/file/63363436630.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/nuketugidelojezo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b49b72dc8a73f2fcae4e0de402badbf8/xisawekasimowapijerijoj.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/mukir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+keyboard+with+voice+inputPDF 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_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 17596 bytes
SHA-256: e9822d01e414ba330077a29f5aeb0f68ef42320878e3e93843ef1c3891056ba3
font_01_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 10976 bytes
SHA-256: 6431ec87b84dac37666a6acd382fdc1e298aeecd4c51d764e498a5d69eafb671