Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb59e8249ada4fc…

MALICIOUS

PDF

73.7 KB Created: 2021-07-01 22:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d08115a5afc3fe2d41a8ff0348b702d1 SHA-1: bf8318a0ffc1e231a7464ecac15da840d91da291 SHA-256: ebb59e8249ada4fc14e3c95c1f6fdf247bb73bd446fa70976255ddefb02924d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c613072d906---vowofexowejatudoxesajeb.pdf In PDF document text
    • https://elearning-chemistry.ro/userfiles/file/diginexusotaxoke.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/2lcr7j9rh0he80ksvjhfmhl1jk/rogoladed.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/14603649984.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16082dec7595da---zoromawag.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a46d96057---lugunonipobagukufivosupen.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/32694390213.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717d24e63af---ladosib.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/juvef.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/fuzodebofagedotituf.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/245da5f28d5281a98f6c89c7f9222173/96639734159.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/4473752404.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/39244893780.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ce932927b2a78403900570d784ff0cb7/61829876898.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105290023275568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=principles+of+applied+biomedical+instrumentationPDF 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_off0000bb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB47 16764 bytes
SHA-256: 38436eb09a188eb586d0b46583408cf06fff1f11bc02bee5530704a899ed1810
font_01_sfnt_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 11020 bytes
SHA-256: 2d1365b34a0d2255c1a6257626cf499730bb37f0f4e7216855e1d786739d56c4

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