Malicious PDF — malware analysis report

Static analysis result for SHA-256 d279bf51c4137b01…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 19:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e4b5516bd01ef084d89abf033ecb610 SHA-1: 73cafe4ff93813e29238ad88305a3647775f0eda SHA-256: d279bf51c4137b010bfa4c5f5c8bba2771270616fa847c3ebddd369d609aac8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=hanafi+law+pdf PDF link annotation
    • https://windfreeklima.com/upload/ckfinder/files/64967687874.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8462c66f8e78a169fa2e776e7f774f9f/pogavakovebogub.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xilezonufojulagi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/50056427470.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/52048198357.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/rewusuwijevuvobipusukoko.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/latuwe.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/jadasitupiluraveto.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/45977079490.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/jimifozux.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/105u3d6k6kthhi2oost65e8741/51371389069.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/81649287770.pdfIn PDF document text
    • http://4bx.pl/public/file/giporepugapew.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/povibowujuzabu.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/n2j0glg5b5jlov17a212q6g2uv/10106382376.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdae4b99b62---kalimaf.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/531218675.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/rorod.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d705da212---40281642600.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a443d3dcbc6---gaminokapokepigunekopanu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/sapolisozomujiwexajipobit.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94cbaf29e---sokidaxojesojikonureduzum.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_off0000bc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC67 9948 bytes
SHA-256: dc72c275126d47c81436d2453617a052a9867cfdc360feff8d15d07b06e89360
font_01_sfnt_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 18176 bytes
SHA-256: 23afe52eb8be61de571fd8cda92c15680e7f281bc164d82c0d531f6f81608b82
font_02_sfnt_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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