Malicious PDF — malware analysis report

Static analysis result for SHA-256 871535bea3af6b75…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 19:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b3cf1e6a2f1be8645eabe8a8782c4c4 SHA-1: 4547bf3fe193ca4a001c7a15040a360e539c0b49 SHA-256: 871535bea3af6b75fac07512a637d68b9b1904e900eed6d513ab7cd13b0ef8f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly suggests malicious intent. The document likely serves to direct users to external malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=qual+o+melhor+gerenciador+de+email+para+android PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/o9f9obsumri00ocm2tljrtre6p/1902481233.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/77987299780.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/492eb7bed7b5eb94a4825505cf93b74c/kisuvumidupopaza.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/3730613040.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93397cd41---59463062378.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/sidub.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/xepas.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/nurosuzeragolunavukemakus.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/deruwomez.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/finafuriwa.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/wugemesu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136efc94d60f---dixemekubowibivi.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/vikinabetipi.pdfIn PDF document text
    • https://jin-ji.com/upload/files/67414306910.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11924333084.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/lejibapusuvowamo.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/nenaw.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/momewovokipifewuf.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/676e76203d19b118d2fcfdc020d2b8ae/puvuxozowuti.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/xivorikixojarepeg.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e8cmepha1j2k3jmq3c1iequon3/xozomakog.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e6f8ed1a---mevasoziwew.pdfIn PDF document text
    • http://360global.ca/userfiles/file/mozuxeku.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_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 20144 bytes
SHA-256: 6892ecd04f2903288f633178a3f83f19663c82e7afc8c373192fbdefcd9a1579
font_02_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 10852 bytes
SHA-256: d2d6b0622ac8a86cb64865e24f4a453d7d815dce39afca2c16931080a7a620d4

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