Malicious PDF — malware analysis report

Static analysis result for SHA-256 860cf8fc03bcc07c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 22:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7df173e233d69f0f50b4ff7cb0b7d6f3 SHA-1: ef887f3325def72f6c57b8b417e5951dc4f981ea SHA-256: 860cf8fc03bcc07cf07c6f19ef7ae0c1b7b03b606bb77f4555e79b9feb36ea77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=solving+using+the+quadratic+formula+worksheet+with+answers PDF link annotation
    • http://growourworld.com/clients/83159/File/4335296885.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/xugerewegejoli.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/24869071487.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4f4cfef1---xugolaf.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160906c82c373e---2726885759.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b5cdee17b---wefidezad.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/taramuwuleji.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/garozakevuwodutonok.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/83712054560.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/jezikidasavenukep.pdfIn PDF document text
    • http://dnepropress.net/files/file/begejevatepofufoxuwemonez.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc8fbf04f---4289947357.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sobumesid.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c620d829fb7---25832893946.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/tukep.pdfIn PDF document text
    • https://austarpharma.com/upload/files/96512666039.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/8558060331.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/pafule.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccde414e4---tokadatipan.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d34eacd6049e1949141d12cce1e9138f/35645541014.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/71759022468.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021081300481173499.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/rused.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_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 19012 bytes
SHA-256: 808662d8b863c1055337301929fac9d1100bab3663d9ca6caadf5d8828096368
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 11488 bytes
SHA-256: 4e74e1165b140048814d43d0bc431f1af54b13629e9c47e31b6890bc67653f62
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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