Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d7bbed55243911…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 15:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8b84d31ad4b5ad70978b53320b33a9e SHA-1: 0e5e04b6ddbc052b6870fdde3ba6b690f50ac48c SHA-256: b5d7bbed552439115e3b93693df3c0b5e6758980b35fbb85b0b94d5ae05edbda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.kymenhome-etsinta.net/tiedostot/files/vupodivejuseleg.pdf In PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/44534354878.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4460b42c743ca15216440448ad248720/6267921597.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6993950164.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/gobalafogagutamejenuw.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e44ecd0528854f516b56cb57b8baf12a/wojunovifinikowo.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/50151572704.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142a005f3a1f---nomamas.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/duvidevawa.pdfIn PDF document text
    • http://belean.pl/userfiles/file/57917377596.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/82142699795.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/dituvojivogi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dioidg0uurhlhldkip4t53sgn2/36706343873.pdfIn PDF document text
    • https://domilot.com/uploader/files/leromamebidusis.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/20179769184.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/tilaluputeb.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cec9abd48---88509108212.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/xeluxojugerejunuvos.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/77549038000.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/vamilatidukumumafejozemu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432c08cd03e---petolofozivakitelag.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/4godu5tbvn5g8e4o7jasmj2q9c/wekum.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/jekumemuwaguperufazilote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+font+for+android+appPDF 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_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 10500 bytes
SHA-256: 546cd8516d6c6c190f77f8af48daba5c4af67299a69e3d2a8733062a922d5b7d
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 18872 bytes
SHA-256: 1ec93ab8d5b7967eb53f4573db6d5fbe1df664ea72ba44115ae85e497afc2c7c
font_02_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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