Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d137806af9905f…

MALICIOUS

PDF

93.3 KB Created: 2021-09-06 06:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 31b906298cf308edfc02aaa542a2d3cc SHA-1: 56f169367ab26bc173f93c58a12d22ee8637361d SHA-256: b8d137806af9905f80b5139fe13d2a69d59936b2955cc1eb31031cd004b9f88c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://oppedisanorobertosrl.com/userfiles/files/zemukebikometesa.pdf In PDF document text
    • http://merwepizza.com/upload/file/88744630548.pdfIn PDF document text
    • http://boldogelet.hu/media/nomuxubi.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/pelikujije.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/12928310245.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/turuwejidifukobasoroxabo.pdfIn PDF document text
    • http://kasargod.net/uploads/file/naved.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b387c0c26---42274626350.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c1344782ca75815008a764429ff1d466/36342319756.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/5226900654.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/tivikonanurifubonebo.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/xavuposavikenefajoniz.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626766149.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/eddbnkodkdfq2bab5k2f47ioau/tamewowofu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/194398f7093f1c5275a06b997efd3f59/94960027990.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/zegaxufufemizijem.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb0854148---32059950549.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/02b0ee737fa689db1caba7b3d968844e/16165645956.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c798c2979e7---zaxek.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8b938ed8da51845e60a15ac6f2948760/suviz.pdfIn PDF document text
    • https://clinicscrm.com/img/files/gijuwizedavirom.pdfIn PDF document text
    • http://uci.ir/userfiles/file/tajadaratubujo.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/24024201507.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/semexisorefabikavutamita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=microstation+3d+manualPDF 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_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 10664 bytes
SHA-256: 72d8be381db16e323e4a7581521daca30a488e65654647dc275b3761e409d50a
font_01_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 17980 bytes
SHA-256: 7f0475c7add9e79bbea8efaafc42072b0a3aeb81af6b01e0ff3144abb8e8c739
font_02_sfnt_off00014f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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