Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e62c93554bcae3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 10:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 591b2381688d49b555de0ff29c5c3049 SHA-1: 6ed60a10bedfeed1a3ef9d2537f5aac5dfde1455 SHA-256: 48e62c93554bcae327e10f3c3cb284d525c1800e5cfbd17dad3ba4c9c7dba087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kanstm.com/ckupload/files/94184415462.pdf In PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210624_0B290CEC01EA0553.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/iqthpd38j6a9e8vovduk5bien3/korazobodomobiji.pdfIn PDF document text
    • http://snsi.jp/image/news_file/velimotoranetanu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6c47a7d4b---54464046807.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/33726904485.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160737107c0b61---menanakaxozifelatolapekok.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adac33fd5---fanorumugidojitujukeko.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f1549263c1a04d42f806b2e1f4f60209/buvelekerulemixafalumiwig.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/jinebewejipipo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/mesivixadakebugoxesizub.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/35qj33norkcetrl3qaa3d4kvm5/33130084839.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/20d25f2af14b7603400f5e548bd02a89/33370754863.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/nlt5k96m3d7j37qf793ah7dmq3/woxedifobesifo.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/xititagasuberu.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/23825278767.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/85127490005.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/zulatexolakezuligapopano.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/falumerawepaliboju.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faed5a35e0---59187007462.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/gizenomojefuwo.pdfIn PDF document text
    • https://mihalex.by/files/files/xepexefozepumapalefuragos.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/58480783993.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c6f82f2e7---22279892314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sinhalese+language+pdfPDF 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_off0000d05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 10632 bytes
SHA-256: 91b7606b3de402ed0ce13fe340278731e457d39b6fa05ded80eeced6f7c619c2
font_01_sfnt_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 20120 bytes
SHA-256: cc195d316244db455c7104f98d10f7cad343921ef2f642465694a191ab77a7b8
font_02_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1