Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d1da8beb77efdf…

MALICIOUS

PDF

93.6 KB Created: 2021-09-02 03:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c54cfbab16acbed5cd070060b857db9 SHA-1: 824ca699cecd57688d14a9e0412a916c4f3fd145 SHA-256: 46d1da8beb77efdf3cefb759ef05b8f4a77893bb622db10c7b90745ea5499638
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://e-uchebnici.com/img/file/15798506731.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e3564334bc72ad0ca0f1ac2c45c2f01e/rojodobositela.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/11166730045.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/56566189782.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/72141830683.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f6ae30f59079379ff84c16f1dbd0ea22/57691984343.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee73994e0---96605938556.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/abfab78a8a9603b407a82cb6f6c0bc59/17160869669.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8cd75299---lokosulovokogife.pdfIn PDF document text
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210817131737.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/22422814715.pdfIn PDF document text
    • http://inercial.es/uploads/files/1022044107.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/625459828.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/46904978125.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/a03b8e89ed1956dd351a1fcf3158f1e0/64015381240.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/72916098330.pdfIn PDF document text
    • http://e-sportis.com/images/upload/luvanaseb.pdfIn PDF document text
    • http://goldmustang.ru/files/files/vakexexojogewufobuzige.pdfIn PDF document text
    • http://candientushinko.com/images/file/30970042269.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/kojor.pdfIn PDF document text
    • http://espicycooking.com/files/file///52464192638.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa80ca2fe---17709170035.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a94142b51---silalibol.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xesejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=live+azar+chatPDF 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_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 9972 bytes
SHA-256: 4dcbaf60f175348b97764ed23c8e69074bbc6f3750fd0fc59deaa28b3a95355e
font_01_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 18688 bytes
SHA-256: 93f6a95f6f2122cbedd6ba30de1cd1c5af0ff5a01322c973d1d8b61238a663d7
font_02_sfnt_off00014fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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