Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8280c205c296de…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 10:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5d9fda4c6e0aa655f8f0e2e16532fc3 SHA-1: 51da059b9721f17c5cc1b3e754b8a4f200b1894b SHA-256: 8d8280c205c296de7112e14f4d63dba42b00d13f801d9acc968970d2368e3fb8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. Several URLs point to compromised WordPress installations and disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=high+triglycerides+in+adolescent PDF link annotation
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191c94fe66---17568697871.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ft2pdkbp3gen0u08e0uclup821/29097633473.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202108/file/87374567896.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/55080417285.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26498e03dd---67285696693.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ecb862b564413a135cb24c714bd3d18d/pibukowomojo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/q9dhgmmiktf4847fgvuo9mcae7/sibukixodewitusem.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7c3ee067f567daba6f4419e2e58c66e4/50172226434.pdfIn PDF document text
    • http://strap.sk/uploads/files/gikixabotusiso.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee357f2127a---jirix.pdfIn PDF document text
    • http://3sdent.com/upload/files/muregurutixo.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/bazenugirepatuwarabamu.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/jeresijesigad.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/18450898835.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xojijafo.pdfIn PDF document text
    • https://glozor.com/userfiles/file/90008196369.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/45099066834.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/penelubejodewidifajisabu.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/94173023857.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db236621cc---55272344060.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6047a0f69b---60368263244.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/16223983963.pdfIn PDF document text
    • http://eternoohydro.com/d/files/8644475074.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f3f1da73---kovaxaralisusidut.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/1904891619.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18a5ade5d---52825685649.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_off0000c3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AA 10752 bytes
SHA-256: d393d03b8c19342435a9688423f2e4dee327a9eed968beec914a2da76d4e9ba6
font_01_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 15916 bytes
SHA-256: 1b44b24635cf805669aace52a9f9df4dd8184a9ddcd731919ad4c7f4d8c55410
font_02_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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