Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16b46f24ff5f378…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 04:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e829137ab81b9e6d97b98dd69e4d461 SHA-1: 9e501f9af325cc47250c59fb32a0e614d9120e5e SHA-256: b16b46f24ff5f3784ea204d4262cfdf77627b9bfdab155c352cc2a6e0b7d972e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=stem+cell+biology+pdf PDF link annotation
    • http://www.truca-taoules.com//ckfinder/userfiles/files/watedoro.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/wofokivezinobixipevo.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/kegapodaguboxowawavet.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6ec599307---rinukupoj.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qqb4ekqklulrojkatdjcspi1rj/30412402779.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e410497c7a---40771599838.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/mowiribesosogagupimani.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16803583778.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/sisikebuwedik.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/78222211659.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/p7o4ebj122bjbu4qlrisb45qt0/mizojiwewoxanevatifulov.pdfIn PDF document text
    • https://digireg.nz/upload/bovekufebugumatufamevozat.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/woxefapiko.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/1878149055.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/68547546258.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/66119371083.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/tavowomubov.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zigokes.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/dilotaxokosezu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/wokobexo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed19a01f2---53745468189.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/penavotitudez.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f8dd1c7e1---xoginewagolituzejofewe.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_off0000c67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67A 10760 bytes
SHA-256: 779c79542206d84b1ce811bc9e230bbf0d6242902f24610f966be49cb7719862
font_01_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16752 bytes
SHA-256: ba7823194a2d44006819c85ac00b69264335bc6179584ce7dbc987772327c34a

Open this report in the interactive analyzer, or submit your own file for analysis.