Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e4961d718487c4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 13:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec19b26169aedc1b1430c2c08a89b1cd SHA-1: d861537ff216fa85d04d3d8c354ba2584f4c6e22 SHA-256: c1e4961d718487c4b43b02d1c7475e234a1d59fad576f1c41a4048f6d86c2ab0
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous URLs pointing to disposable hosting, many of which are disguised as file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=24fps+app+download+for+android PDF link annotation
    • https://tectrongim.com/uploads/file/rivosagobojuni.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/vevuvafegaguxibizu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/barusiki.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137e88e47692---86661725880.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/xejuzo.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/25942154705.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/wafivulesomolizowamipuda.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/19449904743.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/72101788675.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/100aef92e793ed9d0003871cbcc0f8ad/92460430559.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-9/20210909221535656753.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/mawewisiruxunu.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/dobazifapizave.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/vojanipa.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/58574366313.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/kalemedobuvufuro.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/4189860092.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/daa872df6f6bca84283355cc2b1847a0/kewugixofukisotamuw.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tibepuzatupokigimowegon.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/92408071287.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/57529737348.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/durixesajevidelasidoboruw.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/66052062961.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_off0000ba1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1E 10448 bytes
SHA-256: a1f4935bf2f3d600c6f90a2d59e0cc41463eab192956633ea8f12cc20f9debb7
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 16792 bytes
SHA-256: d690063694d5f2d3edfebe39840d104529ed817419d1f76361bce8ccdf7342fd
font_02_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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