Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cb0df133ee21a0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 15:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3e0a8972ab1e0cd66f08b4b32896ea61 SHA-1: cd1b2d21dea6f9bd46c40660987efc80212960eb SHA-256: 78cb0df133ee21a0e7a6d3ead5eee03df585dd1bf928a7e358c98d3ae20b4561
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. These links are designed to act as a link farm, directing users to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier clean score 0.0202

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160782b9a5ac24---dejuvidupakedetebowusena.pdf In PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/62999389049.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/leneraxexojaxupuda.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5a147471---tibimemupiputadir.pdfIn PDF document text
    • http://riviera.az/userfiles/file/nolamokoxetabexi.pdfIn PDF document text
    • http://screen.by/images/file/madaruvu.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/69346761479.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c16780d4e---pufefeme.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/19636096209.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca04b38f992---31958183257.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d19d1b46c8e---86512462011.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/61415994256.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/2432271845.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/bopazijanejem.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/41803f37a2d59899ec9aecbd4effb728/fonozigokasugisen.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609217597054e---92837005185.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a8800df9---44221902067.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/56551962503.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611f132f49a66---furizivajil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981cb0144e1---46950369439.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///25306222784.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f6d3cc6d---vojusesuvizat.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/nukurazalitafamizizu.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/72484974773.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/325394b2fdc053d4c8a41e92f7d4c40d/rinefageruxixarafuxapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stay+stay+stay+with+mePDF link annotation
    • 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_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 18056 bytes
SHA-256: 502f5dc2af449d4734ee46ffc9e880bc7146d4233dbcd13fbb182f92a4b3f24e
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 10280 bytes
SHA-256: 4accd08314c822193a58929a0f09ed7d9849d9ff2f1f03538fa73efc39d4ea24