Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eff5f2d00e1cc10…

MALICIOUS

PDF

106.0 KB Created: 2021-07-17 09:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f74f1ab774bd5c0fa0d61588d5a97b8 SHA-1: c48f011a93c6d06165b47cecb0a350c8fc471eee SHA-256: 0eff5f2d00e1cc10e88994253149f7643d40d7ddd6ad4b2c93a672bb959a4fb6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or malware distribution vector, potentially initiated via a spearphishing attachment.

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 http://fuga-hotel.com/CKEdit/upload/files/18587717632.pdf In PDF document text
    • http://fredericjean.net/oplusco/file/61256036558.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f3fc0cff46fc81b9365613f9861a2be0/47578705989.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/9f778cca3bd291390f37121514d92be2/10820911353.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db153f0528e---17362562221.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070896702458---jemulosu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da3b58320a1---nubukuremigikafenepoma.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3de2d06390---43498127138.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/vesetomepijadowurijuwo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/241e304ed8ba4070bb4ec713f9508175/fozikijarejewejis.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a90002ea7d9---mefasudifulokevija.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b76bcdc8f---rexifir.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kn7aelrtm2je5f70cff7jines3/fefapi.pdfIn PDF document text
    • http://prestopc.it/upload/file/darurax.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/7046121671.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6ff7ae18---sorokesebuvuxitoxobabokor.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce107b286---wakik.pdfIn PDF document text
    • http://flexicourse.cz/res/file/93744328010.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/8fb61372bc1f1f173bf19551845ea132/33707816565.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/jnj8v0cobsne167hqri9a9djd1/nomapenuduvoravemoji.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/71897082510.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/73907246091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=after+2019+full+movie+englishPDF 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_off000138d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000150e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E6 18552 bytes
SHA-256: 93e476266b0f63730165654e8068535dfa7629bb81a5df06019d41b23d5e998e
font_02_sfnt_off0001811d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1811D 11108 bytes
SHA-256: cbdb10e6528ddd08805bf9f8b2ee7c8e45e233fbf17483470210d44c31e28cea

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