Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af78e2af9d58b1f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 13:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e09ff5ad87cd789ed72cf0bfa97f7a3 SHA-1: 0e84a680c6581a935375ede2e841ef1438cdbee4 SHA-256: 2af78e2af9d58b1f559ae284a14d332f56778f5d39146e89df33da9682dbbcab
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous domains, many of which are hosted on potentially compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/20090546509.pdf In PDF document text
    • http://tipsclubcr.com/campannas/file/84346935125.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/83ef5075bdd16ed45366cf6b7f4c429a/22610398655.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77275528967.pdfIn PDF document text
    • http://web5gstore.com/Files/files/38910026218.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b4a5ac94a1781ea579208a284c574ba6/35035051989.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/66296949667.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/vulew.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kikiwase.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109021732243062.pdfIn PDF document text
    • http://neteyes.eu/editor_up/23837137002.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/jusisugabafebonarukiz.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bc1j91qsusee0vomm5rosgr1nv/41026906179.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/57414026116.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/te0frf7qsdb1kbl0k9cgbc43oi/kidepona.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2a18bc24274e464b988c73cc9a9881e6/taborozopi.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sibufemomeniw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915c68d092---poxikowejunax.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fae656843---xagirubokogomaguv.pdfIn PDF document text
    • https://mikludava.lt/images/files/lileje.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/zakafoxinojaserunaroz.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/vajirumupelaz.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/mubadafamutawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=intent+pass+dataPDF 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_off0000b952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB952 16940 bytes
SHA-256: 615ab640a5be44fa91661e0426c31a3053736658081941be5a87f0867a8b16b8
font_01_sfnt_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 9980 bytes
SHA-256: 17f57db1e45cb174e4fc88bb9a248ec2ccf2f9b7b18c5c8fdd96b9cc93218304
font_02_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1