Malicious PDF — malware analysis report

Static analysis result for SHA-256 23be33412a552561…

MALICIOUS

PDF

101.9 KB Created: 2021-09-16 16:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ec5fcad0c4959504ddda4f1587dfc68 SHA-1: 7dc94212201f9886d59b435caa1e66837b2ba3e7 SHA-256: 23be33412a552561b6ee6248eec0fdbdb1e7a82b6239205ef942a80e00128775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to drive traffic to these sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://ketchas.ru/uplcv?utm_term=this+is+halloween+roblox+id PDF link annotation
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zejufinajelo.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/gojuxojirutew.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210916_7D6DBA7906509D82.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/87881269269.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/64523204690.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/sadoj.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/19853163302.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/15306292674.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/14a19e6693aaf27a1bbc40ac6d86c80d/sotoposiwisezizi.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/9447656603.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/nabexepolo.pdfIn PDF document text
    • http://archbot.pl/files/file/guworomusefibeve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0a343733---jezazelawunoxixajitas.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/76078354122.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/54911204243.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/86103264148.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/33739728961.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/29730486727.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/81176729519.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161351efc5b56a---67669120527.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/jasapita.pdfIn PDF document text
    • http://traviet36.com/upload/files/zorise.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/liririsezoza.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/boretoruwopujere.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/63835984587.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/53719421443.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_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 19648 bytes
SHA-256: 5abf20da7433cecc98d076bad339f0ab09d137d0dc4dda6d03745c2a5e803f84
font_02_sfnt_off0001722b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722B 10540 bytes
SHA-256: 95ee25a53679db6f2cd088031499abf141737ddba5a12f1d39aa5496fc2329a2

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