Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c1468f86ff93b7…

MALICIOUS

PDF

95.8 KB Created: 2021-07-31 12:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfe357bfcc042a3b2fa74fc875e3935d SHA-1: b652710fe317c49ccad7ad050f52f79176954998 SHA-256: 24c1468f86ff93b71e880b66358e16b6942a43fba52c2490de842e80503fbf9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, many hosted on compromised or disposable domains, strongly indicates a malicious intent, likely phishing or redirection. The ClamAV detection and ML classifier further support this assessment. The embedded JavaScript is likely used to facilitate malicious actions, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://wenxuezj.com/images/File/bidodobofekilopuruzaleru.pdf In PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d30a198f45daa413f785c00d2483d97b/8563153152.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/9708109741.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/notosuzeserarelib.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cd0629ff3---rorijutajokivisetidujoz.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b272c185036---84938357233.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9f03b8c64c5ec9e911b494833036b61b/mevugomagemonil.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/60745325816.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0uea4cp6m0728sp60202cm59g6/4661587443.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/xurefafefe.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/kalifenokusugawo.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/neliroxanexavozutedovub.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/082005552537.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/gerigewutozifemisevovot.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/30965868616.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/fsgsg3jivhi8nnoqibo943ln9t/virasabuxikafopaselujogir.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/batutidetofalezizabi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa07c0042fc---85566333101.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/nefexujeg.pdfIn PDF document text
    • http://e-district.org/userfiles/file/gifakevilen.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd8eaa37a---dopixu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7ade541971f1ef8afe0c34317a3f045f/vedaka.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/momimosagejovitida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ejemplos+de+multiplicacion+de+fracciones+con+numeros+enterosPDF 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_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 17732 bytes
SHA-256: f7f828e6e2bb4fc9b9e1a694c8b293dfe98d6a6848b379828f2526ee53c882ac
font_01_sfnt_off00013cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E7 10992 bytes
SHA-256: 8ffb22b87d1b3e2b4e3662cfde38e9798d7ea423afab976b26ed6777b7c26a2f