Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dc6da02aab9c66…

MALICIOUS

PDF

78.0 KB Created: 2021-07-30 11:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59a1caaac306c81085116c95317aeac1 SHA-1: a55345653fa2d7ea87898a39685ffdce1bfb478f SHA-256: 83dc6da02aab9c66b9fb9af0a8f96a97bbc7faeffc8b85b05424ed4690a8090b
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing or to distribute further malware, aligning with the characteristics of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7887

Heuristics 5

  • 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
  • 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://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/52adb25b655d93d70912da5ea8e9673f/xagulilofowazogemu.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094606ed98b8---jabozogavokigekopitunov.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/00b35cdd23496b23cd50e67d0bae7d32/nexorefenarokanud.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/60efe7b83c494ce7d3c9f4f14a6f463f/64201393610.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/xefatovananor.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/42766588862.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/bimivuvateromo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a04751f195d260838783f82b1faf6115/55297085059.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/xoxudepa.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/vurirew.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/89435329341.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ff2795d58d00dd247ba6d3ce941f9684/43614924594.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/puvesaga.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/xetasurebezawukugidube.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/magufojora.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/71f4772d6ee454adca1500015c94e09d/75166032449.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4d2ea4428c01ee7336a684f8ca299860/9037070486.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1921a674---wopumebemavi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d80837fc---17606892993.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8080709135---wopirurop.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092114554276---pimoxefalikoxed.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0425da48---sanewuzufirajejo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/76a4a0b3a4c072fd5341987ff0744bdf/54603987874.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b860e18fc5---pozaxezokejurajuwa.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/036b993d05b5dd3535a3b3e2c2b709f2/tubopebodop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+a+pdf+read+like+a+bookPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 10696 bytes
SHA-256: aac9d7490e30703f07ead494e1c44a84997c825d9967ccd3618b9a9f43a82964