Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e89428d51e2755…

MALICIOUS

PDF

107.9 KB Created: 2021-06-23 04:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 45baa2a49693ac1e21c411b959503e6d SHA-1: 66b6385d2cde5c1c916e29ff7aab5f5a47aea904 SHA-256: 45e89428d51e275539fa613ff050de72e8e2903749a8023d64eb630269e81cef
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 0.9996

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 https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ec54ff2e0b9e616b141f6838f59e0b8e/38460230964.pdf In PDF document text
    • http://allnatureint.com/userfiles/file/54252554830.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/27c93107270f4427be7a29428aa81e93/54118774501.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/32026974862.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/adcn34mc3795ikn88olr81scdj/xutilo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2abe7765a---piwogutimasodufepegaz.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609731bcb34aa---ladekemu.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/bavagijudiba.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9ca7a11cc4e47e51a91155927a21a48c/14634834883.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6f65ea98fe9951f34f720c377c0102ce/zabunupalilufetaxaguve.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7a4db9d42e53197fd28ce96cf8136419/gotibozogumowamimaruwukex.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ai57kca1nt3hvu711m8pbcia2r/92404596889.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/katusabinokoxobedibularu.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/53221893461.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/82644092326.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cpu4ad8c694hlnqp8kfpndh69n/48834005668.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/40ebfec15967e3ae344bf0eaa24e74f3/36094953890.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/Om9ozkHLxGw/uplcv?utm_term=yashica+fx+103+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://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_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 24200 bytes
SHA-256: 9f6f44eab93f4e9061c0bd13dae08ba1fbb29901a3dfc6f3480ce05f59a12995
font_01_sfnt_off00015315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15315 5412 bytes
SHA-256: 0cc1969694f7d81f20dabeb26301b82b857def231e79f72015f41e89e9078264
font_02_sfnt_off00016565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16565 11568 bytes
SHA-256: 32d14f432e5031c64e8542e236d533c3fafd5c4a67f8af99b6432ab361dcb576
font_03_sfnt_off00018ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA6 16260 bytes
SHA-256: 16e181ca71e4d72dc7990cf8d8c3e975512de171f03a0ef34f0a60e4602ba9c8

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