Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde6743652acfa24…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 02:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 405e61e60af9f6fd04a272f742721cb7 SHA-1: 8c8f69ca7de46e1d343f4821254eb4c63745de92 SHA-256: cde6743652acfa248d5f9b058b09d3058fc9c87cce6999f1dce1c87ecf9686eb
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous links pointing to potentially compromised CMS upload directories. The embedded URLs suggest an attempt to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tubesealer.com/uploaded/file/56156672161375927d03d7.pdf In PDF document text
    • http://twtipa.com/upfile/files/2021/09/14/66660685.pdfIn PDF document text
    • http://wdnederland.nl/file/nirewobavukozokipex.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/toponekugor.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ad7041600564ab9cce744db7f3f873a5/telunezevom.pdfIn PDF document text
    • http://www.bash.cl/media/file/xidikef.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/8597675351.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/tedagaziwukuliriseje.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/32048017357.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132f010eba96---wadosotimopurunokosik.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/1167312385.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f86522cc---94731618502.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/98767417074.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/7383825580.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/rebibubufulesa.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/5205600559.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/fasoxuravudox.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/71963202557.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/20074493427.pdfIn PDF document text
    • https://brakos.it/file/26664490884.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/buxoripetikiwujajowes.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/6758310091.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/46291153720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=remote+android+tv+apkPDF 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_off0000bd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 20512 bytes
SHA-256: c9d510a7af27aee140a7463952df9d5f5067a8c73fb2f139c33b6d764ff4ca47
font_02_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 10540 bytes
SHA-256: 4ef7b06c63b90d61096ffe3d8c0009b3bee4eb9c835c3f961e65cb0c673ce8ca