Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f03667de685af0…

MALICIOUS

PDF

76.1 KB Created: 2021-09-24 18:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b54357f13aad598eea651125cc132f5 SHA-1: 33f76eaef6bc086490a5ee0c895b585e7fc76d8a SHA-256: e3f03667de685af0d3f6c59174534d4c9a8cd28e000bf37a397e45acce694d24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URI links and the 'SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://drafthe.ru/uplcv?utm_term=grey%27s+anatomy+season+16+episode+8+script PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f2e2e57b12fa1cc8cd70e432be2fdf53/movitutonezavoxigepa.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7841ed67b---vefas.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a8c6b99b258b7cc107ffef92c8c4f411/vumeragamekagew.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161378532a54eb---48184210246.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8047d7394ec21cb74ce33c7e28861571/38701636806.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613855371132d---wufebakipiragesava.pdfIn PDF document text
    • https://media-get.com/userfiles/files/70195913327.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/mulekiwaba.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/70985033547.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/59516066374.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/10703171133.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3954feae---77125830371.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84501288473.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210924_536A6ECE4B1DB136.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/vidugutuzizogipo.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/79417292986.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/penanubukalegexikak.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/578985fc63f613d2fb83444e12880060/90345391494.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b66ac7487d---kepumofiguresikiwokemim.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/fupelujaboxosumiluno.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/moduwaj.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/54277291047.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85360734205.pdfIn PDF document text
    • 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_off0000be6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6F 11244 bytes
SHA-256: 977b4b0d4e9f500f0256e8e8be89b6dfb58dfd4f0c9af24b4a1f9894fc99d5f8
font_01_sfnt_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 18984 bytes
SHA-256: fedb53d595671fa91f754b18819328ee40d360e5d71756600c33965f4812b833
font_02_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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