Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9aa79aa13bf1de…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 17:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8200aa7c0f2bdff2207791911c64d054 SHA-1: 9e1365388a603dd9bd45be5e8250156b760bc7a9 SHA-256: 9d9aa79aa13bf1dee328c915d9aea1e7a1abf3e430a4da89227bf0011de5793d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate these links are intended to lead users to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://chcial.ru/uplcv?utm_term=migrants+definition+pdf PDF link annotation
    • http://boekenwinkelindex.nl/images/uploads/xamaduvasezujixow.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210901132221.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/fidukixizesetev.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/90359228066.pdfIn PDF document text
    • http://vodnik48.ru/content/file/wopusojozezadina.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/tubadukikovavisipenazuli.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/xodoroxivekixotera.pdfIn PDF document text
    • http://gptools.net/userfiles/file/xusifivokulolo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613864c3cbc5f---3512072268.pdfIn PDF document text
    • http://rjt1.org/upload/files/jakakafudagelopoxawita.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381080b4e54---17016199815.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/76228034284.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090105211173499.pdfIn PDF document text
    • https://mbbs.hr/files/55296428353.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/99506423526.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/zaxapefowedo.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/88224557981.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/koxazasevuboveri.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/nenagofujesina.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/muvewabijefixexawotexe.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7d2206bd---bedasaxumukedet.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/19804381917.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/60173068997.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/govixukovum.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/13716126538.pdfIn PDF document text
    • 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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 19024 bytes
SHA-256: 7451af5af9645958d27886c6926cd4812d7e5f2a28a0aa7f9bdeacd5f78ad955
font_01_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 10620 bytes
SHA-256: 890055c698e4204acb8e66669e70ad41d17f03827eb5e1fbc5b4c1aa4c4c56bd

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