Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8622406e9161862…

MALICIOUS

PDF

150.9 KB Created: 2021-06-20 19:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c648c705b2110df0d57d84218902c0ec SHA-1: 4daa903f651bf739e03a9a51c8e6e9b89fe391f6 SHA-256: c8622406e91618621d38327eafba6853df51cf463a1398c5bf6801fdaf5ef4a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to exploit user trust by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a1a3598b---bafuferuvudezazevi.pdf In PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/s3bjnfg7p9jq26ihls1tg1og01/73309998960.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7fa2a0627d7869c8b3ac70147422f860/70476894894.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/15060763876.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/39e569b4bb92785310e72f3fdf3558ae/nitagijojawirodugupevipo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/62060174c17ad922a09197715e268142/finon.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/lngo2cgbb2dp7pqj0tmllqmrl7/81020980676.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/da1678a38962c1153355f996ea862137/21804586471.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcff63a06c---poxafilojikuropala.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070cac0db316---47801006452.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607006a65651f---gilofevorupomepofade.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3afed357b---liribuzarorelemixijom.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f1b27369---77066962762.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a017d641bc---36118761299.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/49077539b19a534832fbb100352e7946/pogekilar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ascii+and+binary+tablePDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001be33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE33 5164 bytes
SHA-256: 67f80a8fff7307ff69b21a26d4bae32385a5ec5b8181b85e0904707311fa53fc
font_01_sfnt_off0001cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFD8 29392 bytes
SHA-256: 4d42b3f05a9a889264888ce4b2f125a20b56236b5fe49d79c55e7d1287c842fd
font_02_sfnt_off00021c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C5F 16200 bytes
SHA-256: 6cbe8122777778c8e4c7fd8f32940eb19fb5f9ea7912c303c7828fb6fa2999f5
font_03_sfnt_off00023198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23198 13500 bytes
SHA-256: ffe90b11c41ca4b9cb6475a50453c7b67ab5f1925adf7b30648d61d5b752553b

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