Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b3a43804473997…

MALICIOUS

PDF

88.2 KB Created: 2021-08-15 14:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea6da13eb04a84c8b02ba50ac9f09736 SHA-1: f7f5ef5cbea5dc30d9ad3ab19a3105607812f99f SHA-256: 45b3a43804473997a6b61ef8427072eae7e26a3919964403637a8db45825ca70
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users. The PDF structure and link farm indicate an attempt to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee29af36db---23931598705.pdf In PDF document text
    • https://bodegoncriollo.com/userfiles/file/rowuvipifafefepimabadi.pdfIn PDF document text
    • https://x-software.cz/data/file/vadavabuvonil.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160856ec81666f---togugebireporu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a1ed1060e---kizuviwupaxusu.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161182e27c1ada---zabubabasolufiwoz.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/buzuruxememamak.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/xijitujazipil.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tamhnop84fv5c5mngcgogc62vb/82954932098.pdfIn PDF document text
    • http://gibisch.com/files/files/kiliwavujakafosi.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/rowemidabilo.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/dolojuselakaxifitejo.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/2110164942.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/duxuzivezuxupixubosop.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/zuxawubezitejikonuvuk.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/a43b567a28c2e6857ec100d04d1db493/geluwapapugumufo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3aae66aae---83669185166.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f8ed4af3d8---wufebovuludewozoxidew.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03050a2257---sunasofusivofizigizokonib.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/73371702444.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/83903578579.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bajodonafewezepuzupumid.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d73194eb9---25555591198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=instagram+birthday+countdown+ideasPDF 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_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 17204 bytes
SHA-256: 3a26fd67f5fa2cf49d079e863cedb439674a0107a0a7f6468564b825b3304e29
font_01_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 11164 bytes
SHA-256: da52d0ed275cee4e94764d37f22385e000ba530f4ed0124f8d689c233d51d636
font_02_sfnt_off00013811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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