Malicious PDF — malware analysis report

Static analysis result for SHA-256 c738a136d91540e0…

MALICIOUS

PDF

85.2 KB Created: 2021-08-26 04:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe069e168a18178a0e2c133709f6cf57 SHA-1: 6b8b8874b711d4f95ac7856d810bd4df1a1f24b6 SHA-256: c738a136d91540e0d8d77675101197b493972b3e244fd2adf3ea39994280c328
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5fa025ae---kiwek.pdf In PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/newifovegalekiwolaluxi.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/23943778300.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/86844776312.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/68014576100.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/52044771858.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/78690761467.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/23224549146.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/46606897349.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/78147683296.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/darunalim.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec3fbc9718---bakej.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8193770b2---toxiso.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/43728532730.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/wokubagadita.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/1776007761.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/punekuxifasixobinidaradin.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160939ee05480b---tusunuzilasopaka.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/monevepimorebato.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kizugewis.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/kimirixuzuxepexazozoz.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/deril.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb04a0abe---xuvujum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=software+for+converting+word+to+pdf+free+downloadPDF 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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 16808 bytes
SHA-256: 1c85acc4835a5912eb5c455158e9498bb3c60c353110d9bf8183624fc4982326
font_02_sfnt_off00012db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB5 10856 bytes
SHA-256: ca0931fe2bedb2b2ba2ebf0bef9505319d8d56a41c1be3d17b8df2350d846ba7