Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c35401013beeb7e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 16:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b09729a59b9380fa1ee8a31b83549f4a SHA-1: d5f8f28e16029ff63cab491d608d93bbe75afea2 SHA-256: 9c35401013beeb7e87bc441832aadbe9ac5a9abaf20bab2bf6b8e86035587572
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://infrive.ru/uplcv?utm_term=hack+8+ball+pool+aim PDF link annotation
    • http://xszhuhai.com/uploadfiles/files/74669952884.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0adf780345721a6bf598985290518a23/69027426363.pdfIn PDF document text
    • https://invision.buzyhub.com/files/meterurafosopigelir.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/tevob.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/zinebupun.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/rebeweruxafekoxozid.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/rekil.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/30339338069.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210917050913158.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/tumon.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/nufam.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/fanir.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/winowowa.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/83520786307.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091807013170554.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/feripejisaxewopufip.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161481c32ab7a5---73081139005.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/nejufasijijowo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/95058541994.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134b09885cb2---sukevevedabudofal.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161456801297ad---zazonura.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/sekirenugedo.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371e3504e51---97669218708.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/14827670092.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_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 10364 bytes
SHA-256: 4fb32efbffe6010e10fb935a4d4a61df76a2a30775da2dd28018aaf485f1dddc
font_01_sfnt_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 17656 bytes
SHA-256: 5e6f58601586fc43ebadfcb5f05797941584cf1bad4a42eefbad313edf1114fa
font_02_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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