Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1bfab41e376c78…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 00:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 286f7fd4e3c2ca6388609c5e3a7caf7e SHA-1: d6fb332961737d8d67d68a27566c42c509457471 SHA-256: ea1bfab41e376c7848f02fd0c3230767cfc02cabe743417fe2f1b985c5917ff0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e6a1a4ae6e02d3c525db441340fa30a0/kefib.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160da38e52ad0c---kutisunopebirudejomimuk.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/bowatojajelap.pdfIn PDF document text
    • http://schokozentrale.de/idata/kadobiwipesa.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d88738d1---xelawipojukabefulewe.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2f1e3a9c---zibozomefomelugogaw.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/setusoteputororavuf.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/fenozokelenidodarawevez.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/metedilizuforuneg.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/migitomoset.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/98e8d6f7fd3241887703689040045236/dejidularoxavuvagured.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/31975454092.pdfIn PDF document text
    • http://kbchina.de/upload/5890447127.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/xafotesuzodawopopegikex.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/37429128081.pdfIn PDF document text
    • https://bdcomunicazione.it/file/4128193082.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/afd4835fe87981c7e3a8202d070ea85f/jatedirorijasojuxa.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/nuzuzadesitelu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d360208273f---rurolizaba.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b88fd25ac7014da2f4313a065e2c584b/19192360544.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16100e3709ff36---vajiwudezelomupot.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pipuwakenop.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/vinamiwepoxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=behringer+eurocom+ma6018+manualPDF 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_off0000b543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB543 17824 bytes
SHA-256: 21596a5265d9960f87a7d1ec7422902b5076f44d846a1efea09a7769e47b86d3
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 11112 bytes
SHA-256: 6f59165869b2c216612feca4a475e3d35ccaf22729e83ba3673a135422b6fa65
font_02_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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