Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ca00df73e257a0…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 01:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3607ff73d10323dc209cb25fd09483c9 SHA-1: 6003e0316d6d374f5b065cdd8b3d4fb4c956935d SHA-256: 84ca00df73e257a066cb0311bf9e18a206bc5c2f54b21a78cf62ecde31cb002b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://darstin.com/userfiles/files/20592261274.pdf In PDF document text
    • http://rsti.biz/files/fck/file/60072133696.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/kusafimafifejuwel.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/miwikejekazijovebupozo.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/79111814857.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/kinunubojodasodi.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/29617432370.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16141057b1fcc7---maladizirugodu.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/75404789154.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/5586031886.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98a8f1575---26787487078.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/25f784f955b0eb2587cf3f40f9d305b5/xelekumuruzutugunawajo.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/90809388766.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fogezitaliguwotazag.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/vumademin.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/83151747352.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/wigojiju.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147b50cd7c5a---29049758112.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e727ab30f---weloxosas.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/najumoz.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/fesubuvaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tethering+android+tabletPDF 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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 10460 bytes
SHA-256: fd3a75ba67925832329db8badd32d9afe67ed53d7fd3bf499e4c19eae743b2f1
font_02_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 17440 bytes
SHA-256: d77e1bbe951ca49d2c8b6dd0e124454e077c3c0555221efe1aa531e67b65f708