Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eec1de0c0e6d082…

MALICIOUS

PDF

99.7 KB Created: 2021-06-29 23:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: edeefa120b0a87f0dbe86f650967a84e SHA-1: 7be0071ba90fee8dbfc090e77e4cda20d64702f6 SHA-256: 5eec1de0c0e6d082cbd121c4c2eea31558eda38b825078d8a4835e4e7a69b056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9886

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://nomylo.ru/uplcv?utm_term=what+number+is+after+999+trillion PDF link annotation
    • http://seabeachthailand.com/UserFiles/file/84400936284.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458ad3ea9b---47084214542.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078738e0414d---40229681493.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/1239295777.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/47839700826.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/eq72d3q33infj8pdb1bnv286d7/zudapilatafufufozu.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/91217319445.pdfIn PDF document text
    • http://www.celso.org/download/wofoxosobetalo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/53973942802.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210530193806.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/lifobutobodolomipap.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/gifax.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/vufirazapaxaxiririzidi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f2b8caf7---wabebazufozebokaxikin.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9337ca26215139f7447b7e5be4810cbc/94459309691.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3ec6cppofv75k1ovd6bagmpn95/70954667324.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d97a5db8b54fefbfe81fcdf2be4d52e7/92063226924.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/30449578332.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176ce3f92b---rizixabuziwubametilexixo.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf336638c---84434008382.pdfIn PDF document text
    • http://myredm.ru/uploads/file/94036065152.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/31ec4e8d3bc22e6024a755b180bb795c/pubejokasafazes.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1c5e979a---zudutajeximolivavezak.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 10880 bytes
SHA-256: 88cc273c241f8a36685726187fefbc724ee2a179a1492b19d63e7d83a01bd244
font_01_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off0001367f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367F 19344 bytes
SHA-256: ed3fd73f1f0be20097d4a12e4042b8737f264250ee6fce79e03b21b223636a1a
font_03_sfnt_off00016919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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