Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4d6d59a899079e…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 16:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1dd04315b13469920734dd46e204fff SHA-1: 0ceb976dcd1158fa7834a84bddd3172578874873 SHA-256: ed4d6d59a899079e4e449b8a3e9423123993d25e6ae4a36e9a3e52079b6e81a2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The structure suggests it's designed to lure users to external sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.myosiaffiliate.com/199trust/img/file/xikubafavipileza.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/20gpb4o5kbhr5gcb69vbvkdb7u/22189703963.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/mibunixojilur.pdfIn PDF document text
    • https://motacademy.it/file/38295405711.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/zemawisikaxok.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/n8t97hmq9qtd757v8d12pok251/39060105328.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202108290846378211.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f28a90351870bd80e1205572b32f84cd/7046963336.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7189db12---92348837133.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/32387055331.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v7cn616h5vaib4mf2egr3cf3je/90181589385.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5d5bf6d272f9dc7d5f0530112c1ddd73/gerobedixiperujida.pdfIn PDF document text
    • http://yoron.net/up/files/raretupepevamasajisutilop.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/59944593881.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/vuzufakabuzibubekerele.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210802112832_16e3i0.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/j9ofkh5lue9vr1e8mhac3e28a6/85825856647.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210830174332.pdfIn PDF document text
    • https://dm288.rs/slicice/file/jebofumif.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/vowuwoli.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/notivivokesaxik.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/82211309477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nun+in+hebrew+meaningPDF 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_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 10428 bytes
SHA-256: f2757a2a48512f449905c1fbb26d5e1ae76aae6580b4c04d65b5a03a6640ab5d
font_01_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 18988 bytes
SHA-256: deb2c50a7a55e88e3389c70e0fc7371144db7f2894fe16b1330cba18080142d2
font_02_sfnt_off00013cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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