Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51093762450d0f2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 08:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5a54ea5fa714deb0776d8bfab938a20 SHA-1: bffa4a0205bf0c6a3c43a2b72cee15eee02fecb4 SHA-256: c51093762450d0f294f1761267aa74d805dc69de3cfc3bd3c2253afc468f765e
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'lure' heuristic suggests the document is designed to trick the user into enabling potentially harmful content. The numerous embedded URLs, many pointing to PDF files on various domains, suggest a link farm or distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/52063903770.pdf In PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/xutigamonugegomux.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/goweriposutiwalevugezix.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36618816891.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118aaaf7eec9---goxamafovufexogis.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/samonixepowotoluwovejozez.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/75244148958.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/dixidinivalegiwubu.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210819172941_768793954.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/4723783317.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/tugezuvanowepozur.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a89c09d71---gemoji.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/jewezafe.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff2918e8c---57272117759.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/vinasutugiraxonazu.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/mononegedagororofenagalev.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/74464734438.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/rajake.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/7feca4d62c40dd7b8154514bf53c46d0/fesulenenuluderise.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/36654656828.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9506b1cc72bd4123fc3f09e601567a29/vukevu.pdfIn PDF document text
    • http://kbchina.de/upload/74186093170.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/litedumuk.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/todufazugitinefil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=excel+vba+code+manual+calculationPDF 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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 10652 bytes
SHA-256: 4e01865c99c33f2ce6664d2a056a3623db9e700c40931202c734267a16c4d8a7
font_01_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 18676 bytes
SHA-256: 0e8a6c69b39f730b7324603ac4085b63ffa6a2ccdf54006c724880c152b93f89
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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