Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69bd1b53ef41c81…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 09:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b25abc83582be165da83e95cc96cb3fe SHA-1: 55126a59065d287287489d66370ae0c324459bf7 SHA-256: a69bd1b53ef41c814bc04e08b2c6e7bc64705ad475b506106c9f39b9ddf3a45a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external sites, many hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The document impersonates a cloud service, a common lure for phishing or malware delivery, and the embedded JavaScript likely facilitates the execution of a malicious payload or redirects to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6n03aqrc9dl6njdhdrqva1l9e3/rozitodujekexakevelo.pdf In PDF document text
    • http://homeopathyhongkong.com/files/84128579994.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/94737043306.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/resomipujoxurerima.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110351bb6ec1---xetukimafexobuwofujo.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/59711351883.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b3b2d082086359c21faa1f8ab8d7ff80/vikifizolejusizazu.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/17907643844.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/80393729902.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160981bc78342d---23777658777.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/60390935447.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/tipobimoviriduwapib.pdfIn PDF document text
    • http://mahae.hu/files/files/gitasiji.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/43a3133fccef210bdeb792b0848e04dc/912410703.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/29102104094.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161256f118089c---28614961204.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/satadosunar.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160927bdade21b---zagelemar.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d8qja152gsqjmh19170ejrk875/larilagiworo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/48099628299.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c04d9ca668ee9a23979ec05fb36ea7c0/55036477198.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/af1d8f0f2d789c201acd4bceb4348d49/molexefirevesilon.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/kijoxisoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=surgery+book+pdf+google+drivePDF 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_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 18376 bytes
SHA-256: b7daf23e710da88b1593df90303bf47e90336aebfa48af45893c61659dbdd342
font_01_sfnt_off000123e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 10728 bytes
SHA-256: fa1fda3df8980ecd9a27812d85270380e22b8e845627ee9edbf4bab9ec7657e8
font_02_sfnt_off00013c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1