Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7a7902cb2851a5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 03:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac343bcabd5fdc7a3990f61725d8ee48 SHA-1: 712de0b7dfeb132e560f4d604d31d751c7f90387 SHA-256: 9e7a7902cb2851a56b493ab8f35d58cd36c0375c8c2330ce9124690a82b36ad7
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the ultimate destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840c118eba4---xixivexuvodupale.pdf In PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/linusadojibobalusekitunaj.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/jenilubaro.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/23840338726.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e4dfc28fb6a6f05df443e5305019b3b4/devixituxalozebesara.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/87711453302.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/dcsdfv4f1cskfmt962228cg35r/biviwowixegiwuxud.pdfIn PDF document text
    • http://gabortech.com/admin/file/gomigemuwovu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/nazodejexej.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3010a65fb663b6f27f112ac7821547be/71989443429.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/edab03be38ed3edc42098af118dcba8e/wobima.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/zoxuduvorav.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/95553766050.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10a3a8146---85443573885.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/35812a77015486f81ad226a58fa4b8c1/42639439100.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40fb1de94---depuzoniwu.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/nawedasujokar.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef1bb8002---robikesesimewise.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/57281234139.pdfIn PDF document text
    • http://logicamail.it/draft/media/bimudowusavegedupozeni.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/51415257195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=writing+prompts+2nd+grade+pdfPDF 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_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 10908 bytes
SHA-256: 76110803f86e6cb2367b771e6a3dc0a5617285ee6c85c660b5700fc765880cc1
font_01_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 17788 bytes
SHA-256: b4ba53a76b18abff121b53a1da46d75785a3e0a3d1eb20aceac6747e846e16c3

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