Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb688547f333aed…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 16:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 561dcd34b3c066529d49825bc83f71cc SHA-1: 337ee353e5ef605997b65ca82612a557983e6893 SHA-256: 4bb688547f333aed2b683fe148ec629ee83e6394289a6cd7caf0e625100a6d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=god+gives+man+free+will PDF link annotation
    • http://changdahk.com/upload/wasikinobupufebazoji.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/riwipemonigoxaloj.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/4344bdf835bcf84d40e5337467d9d6e1/rofipularirikowi.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/vurokub.pdfIn PDF document text
    • http://vo23.ru/upload/file/51061946095.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/7093043876.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/8iekprnjaif496lvu97pf5i4li/lijimesofitipimuribur.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/514141681609f8b6210bbf.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a056ec6a5a5---37643878047.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f958346cc---54577953225.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2591b08357---zefezogigawarekit.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/92147057209.pdfIn PDF document text
    • https://birotex.rs/images/files/siwiv.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/724vli98tv906rd9sdrq1ij7b6/2663251862.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/86933413622.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/87tis9p182v4j00ounaid2lbh0/silezuxisifa.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/93946203131.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/70338627312.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1505c8d4d32a90994c8c4d9e4cd94c94/55619755532.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/46691070159.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092447aed999---puxapivo.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/99837881305.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/pegifoxizixejutegagetu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6785ec82---dinirotubatofuvi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qliddvnho7f0p9lqjureoaf3ph/bozenegup.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 18164 bytes
SHA-256: f19142417925dbfc801a94a4b6909dcb4d30778faa881b487e53af9d40d4c66a
font_01_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD6 10788 bytes
SHA-256: 59a1bba713ec3e82d184a922682b77f1058e088da2a686341c28341913c46633

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