Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f4ec0cc63d4887…

MALICIOUS

PDF

137.7 KB Created: 2021-06-23 00:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a99775159d0d49ab9fa9f2e64e5f152b SHA-1: f38352a5f927e56f2ce1e53b8247c9f4b6752a89 SHA-256: 32f4ec0cc63d488774be0a4daa00a48a44e70766760b88dc633ac7fa9c709ca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9991

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://rana-international.com/userfiles/files/46304704565.pdf In PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/7huecmvrjk8sf0lsvskdv5lsdu/jonenuxaxanogi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fe5229dc9e823525f754a62c6d4b237e/pavula.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210613111714292.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a035ae502eb12e55a83335ea60cb4297/saterademaselixopibep.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/c788nmr1bu3n38dh9b4ckt20u8/totuwiwibuf.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a599caf0---zokugijomedarurojurotifu.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/jexudosopide.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/078e2ce39d861b36a932fc3d4ca3afc2/gabiretobuzomexor.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a39de9418---fovotekekenexotepadapubal.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/xuturonewezedis.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mmn1dsh1p7glttrs4ptr68lcn2/77775241421.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c5b33e839c8383afd7e55e0e797741c1/vumipibulamu.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/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kobayashi+dragon+maid+ovaPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 48672 bytes
SHA-256: 851e680f20794b9489f257f33cf0f8e01d89ff50e2d8503bc4e730688a6d40e0
font_01_sfnt_off0001c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C427 5480 bytes
SHA-256: 6922d4d31bd9ea6b0981f9f1125dd280bdcd408db9c5b27c4a3f25f3b33e8e95
font_02_sfnt_off0001d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6AF 12744 bytes
SHA-256: dbaee38b4f3d2019e44198f02e2342887eb0bcd7d0398776aa282937b8bd0a4f
font_03_sfnt_off0001fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEF6 17220 bytes
SHA-256: d4f51dbfed32afdbd10ca27c12309f4f061ca8c456abd0259f0308fd4b13e855