Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b8b7325cb89ba4…

MALICIOUS

PDF

74.5 KB Created: 2021-08-30 04:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c133861896de27cc55418c2b965ee11e SHA-1: 34770bc290c067763e5f8394fa77b2310044a955 SHA-256: c4b8b7325cb89ba41f804c1f018eab4f9c1813c342773233b25871fc32784cf7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The file's structure and the presence of many distinct hosts suggest an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://crysiq.ru/uplcv?utm_term=leveling+zones+wow+classic+alliance PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817e6cab4c9---pinusijelemumu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4e786711dedb0bcbaeadfad1dd4efde0/42348581799.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16106380a00011---80079304879.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/63420594142.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dr7gccgvckapgu6dneg00db6j0/43466746100.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/nekulixidugu.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/77555091492.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/83024696832.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/95778162714.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210803_F64949599A22F321.pdfIn PDF document text
    • http://charivne.info/images/file/kokus.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/3410563934.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4cead8bdda39d28f74e45feaf81ab9e9/titaregixibe.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbdef69948---82472197894.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/falupupojinasuluvorufa.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kiwixidizebawose.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64862be12a---81483457698.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f52aece0b1---rupuwutanidirepawu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8606d483bb581247ddf2f2aff8e6970c/refudejamixog.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6cda5b428---naboxiluziwewaxuno.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zaxuwogep.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/14437404166.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ffe9c4d30---30019524144.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c5195b2a13fa26521b4785841fad5c83/rodawe.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/53478509694.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b26412104f4---katotagidi.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_off0000c23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23C 10376 bytes
SHA-256: 294fce4d7a9ce7152deb6365a61e40b4a5af040686830704c2563e8e45ca913d
font_01_sfnt_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 16400 bytes
SHA-256: ea0aa1b17fa766fc234229c7ef78bf56ad21802c627b001f32c29c60b7f316b2

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