Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c073fae5e784926…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 14:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b82f336cc7daf9c1cd231da4c2f31de1 SHA-1: 6127b883ed6c1be09c4e36a0656ae1138506db78 SHA-256: 2c073fae5e784926acc227fe2ad30954955f66a9427d73a9aa20f8e8f16ef82f
96 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious with high confidence. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e8435c44df96babb57fdd13c26c398e3/vefidogat.pdf In PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210907213330.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/wugiwuzogadonaruniwonoso.pdfIn PDF document text
    • https://cargobull.cz/res/file/dubobagem.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/gunelobazed.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6a1471ab---81634767874.pdfIn PDF document text
    • https://ambalatender.com/upload/files/55976867972.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613994f4494e5---15293334143.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/dakaluludujebebir.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/63481869598.pdfIn PDF document text
    • http://identik.hu/editor_up/59660791509.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/93883745002.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/kubimijozurogules.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/46651954994.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/titixe.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/71434554759.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/85197969198.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/55366422666.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/42549058198.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/bidexamobedifalowevanupi.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/suzofuzulanomonetapojapu.pdfIn PDF document text
    • http://guitarenko.fr/img/files/wuwunamubalomid.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136495512e87---87251996382.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0dafd205c---77815354753.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/20785280041.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090313480270554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+tablet+settingsPDF 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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 17652 bytes
SHA-256: 89e3103920f77e4a607c8128050c4a3c4bfc9732c4f3ae946cfccedaae8f6bc6
font_02_sfnt_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 10544 bytes
SHA-256: e036038bbee4168e9906b2824fecc31a4f8b53a8b8492d816c9930c363a2d19e