Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c6cf5d789010e1…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 17:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc297723358a00a234ba1c4ae1d6ce92 SHA-1: dc6c672b76bd12c9a094d265ed54c32e8a619ad7 SHA-256: 63c6cf5d789010e138f8ce9f9040ad45ffda66facff487612db158e8ceae4896
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=bertrand+russell+pdf PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/08f76f226d375ffcf12281c875af1e98/pupinamot.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/33783116975.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/jifipaxir.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/94404621128.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/31614498438.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/vezojubitu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a315d9bc---kodatipudotigazegagavi.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/624287553651631960601.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/20877409050.pdfIn PDF document text
    • http://idroter.org/userfiles/files/pegoj.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210907204753.pdfIn PDF document text
    • https://jjpremiers.com/files/zoxudepuv.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614acd0c0921e---19439946382.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dfb4844b9e39f751660a3616561ff9c5/64751151074.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/gixavig.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-21/20210921174649901285.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/dotaw.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e0481eda---69907223870.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e734efe49---14838817369.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/nemulepuzisonenojifunu.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/zakigipafavinetuwuralaga.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/19195979872.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e93f7066a9---sakupopovugenanuzafegos.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/tuxisutulixilatas.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/suwekipat.pdfIn PDF document text
    • https://argumentua.com/i/file/16781443103.pdfIn PDF document text
    • 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_off0000b7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DE 17752 bytes
SHA-256: 448682487848af2c238910bd134935fad31c345289e8c8a5140887f21ec24701
font_01_sfnt_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 10432 bytes
SHA-256: 15e9773876e17520b7143df7a6cca1ba2e5df0f00bfe7f8272e5fc018d46d104
font_02_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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