Malicious PDF — malware analysis report

Static analysis result for SHA-256 3058a70f9423e8bf…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 20:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c97a6b690a2613d125e990aad902fc6 SHA-1: 1aaa7814b6a2a7d002315b1bc0c76cf637ca0fb6 SHA-256: 3058a70f9423e8bfa95517d5e9485dab4757dcb670daf3d62b9b279b0f9ef559
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 and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://otoozevran.com/resimler/files/lomarogepewuwajibi.pdf In PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/79914746909.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/62c886e549ad45bb5227cbbe4f7b9b5d/bukanemerepiw.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/68681022048.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210904004308_1899626140.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5j04eg4muqcgnuiqsv36lfcin6/bikiposi.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/50068205892.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/zobabalegomubo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d0b9e20e989771577c4e457de4e8d1eb/55020310558.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/20848391951.pdfIn PDF document text
    • http://maulich.vn/attachment/files/67379034868.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/romafilolomonuko.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/nurepuzatamimifafuxuwise.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/20390003113.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/zeneju.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/zegejir.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a57ccb8d299f4729c24e20bed745f351/56295546010.pdfIn PDF document text
    • https://windsbs.biz/files/file/97751907493.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/kewuvalalero.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813eed155e---fugurakosodupadomobes.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/27481129915.pdfIn PDF document text
    • http://ch-yang.com/upload/files/pemudenaloxozinunikegenoj.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161300b83983be---27652979313.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/gewineroda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+instagram+followers+2020+no+human+verificationPDF link annotation
    • 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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 11256 bytes
SHA-256: c444edaedd55037f8e43e9412fbaa819ea4aa2014bfab4cb297fbeb9c0482e56
font_01_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 17012 bytes
SHA-256: 48727a00b9f1e75943cfd321562778ab7a47840d393b429a83f85dc8bc1b1491
font_02_sfnt_off00012f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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