Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d6f3c4877e7619…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 02:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8947e17c80276ebbc3e4a38c5710eafe SHA-1: eb982e6c9280f755ba722281a1c92621b27247ad SHA-256: 53d6f3c4877e7619a07525bf59c871f656ffe93dc6daea98736b049f92e2ec78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Numerous heuristics point to the document functioning as a link farm, with URLs pointing to compromised CMS uploads and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=super+games+offline PDF link annotation
    • http://kibbkw.com/uploads/file/32461770117.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbeea99e62---71976151315.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/gefemojixemufo.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/pabixeminogijekipo.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/mowifegezemajuw.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/rubav.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawuzifixiwepagiloman.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/nidutipeto.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/nudiparilakepewanewudof.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/jadepiviwotapimimonanime.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/jepivaxijebiroso.pdfIn PDF document text
    • http://orthodoxnews.us/file/dabilizugizilefifunovufi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/kigepaliwifutifosixafixi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b4bac9c3b0f69b582336fc4483a21931/81448781034.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/gakozesesazekikin.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/wotogurewijete.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/58758271664.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/pawupodanalejuzoxab.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/53735649806.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/minitoroxemotubujerabaj.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/87878185764.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6e5a5bf0df3d22013a604ec97097a14f/renofapuwusap.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/merawibujovexetafeped.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/43631209376.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/58863140852.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_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 17168 bytes
SHA-256: f9c6ae835bb7998de794f076f108f4a07ac44986610fec64c1537e3ef1768f96
font_01_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 10780 bytes
SHA-256: 9202b93b5ddc07135bd7e08b91dccdbcc039d4f5a565c29959d29fb87e033ddb

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