Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae0db5a5a75e34e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-22 10:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2d0bd4073a79fe264edc05922dcd5b1 SHA-1: 30046151df517585789dfae174f66693aaa237bd SHA-256: 5ae0db5a5a75e34e79be4c16d4132afc5cda737bba87578233f3f1757c48297c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pmcp-avac.com/files/upload-ckfinder/files/nates.pdf In PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/6599576417.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/xapebibavan.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/denemajusefiwegare.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/rawojavepeni.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/6878574843.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba4849f5f---84512283015.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/89676882032.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/talanetemupozoge.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131c529ab09b---67071139807.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/rudomejuwi.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/69875173669.pdfIn PDF document text
    • https://hinaweb.com/upload/file/nisegabivajetijifekix.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/87286650087.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/furanutorobewogemitomas.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/19250906986.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/rezibagidobemexidaneriwa.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/73909511504.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gagodawirigolujemi.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/97449484784.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/92680503425.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/8307929395.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/wikifexizolexi.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/wazanutotuvoso.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/mitosor.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/91227687862.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141742b48329---554964175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+screen+mirror+your+phone+to+laptopPDF 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_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 10928 bytes
SHA-256: ca90c611bebcd357eea97be05122caed8e2f0fa4ba1c169c8975a1bc2e59a456
font_02_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 17932 bytes
SHA-256: da34cf8c5ee8dbdac9566aa17ac144a0ed8c2f9ba3c9bb33482522980aaf32c7