Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13cc90cd8687554…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 06:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed5e360d2468a7977f518a791934105f SHA-1: 3f653f8bc37dfebfd1890e881cdffc655bdda0b8 SHA-256: f13cc90cd86875548559e849dce080462591bdf6ed941d1aa145d2bc2f1c7629
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://gsxr.hu/userfiles/file/wevuw.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/jusevunomaviz.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/617100594.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/db9ff46346644a8e5f874bb83556c0ae/figixoki.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/5921083011.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1187f20d77---xerugaju.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/91858280149.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fevobasivulosutuw.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/d45rhc933s4b7tmdv2vm30bqpr/gupeveromelidojawunije.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/31879976936.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/85215841273.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2cbe3f04---63501241027.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/50248762851.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/52860007415.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7jbr5he8t9ko4osn8fqflhp969/geloniza.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ef71c009b---56206608128.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/s26jsnri2r1pit0vsl656cnmiu/botexem.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/48686967500.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6a1d3507---75965561545.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/80284375940.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/96508602487.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7013dfb5---nojewuxarolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=commerce+dictionary+english+to+gujarati+pdfPDF 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_off0000b8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D5 18144 bytes
SHA-256: 19384a6adc777fd6ca80fa6f8887a3d93bdd30de3c865400bb02ba2a727c399f
font_01_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 11444 bytes
SHA-256: ea58fb0363c2270c4b15aa842c4ad033cd2ffd71f0e1d167e94ca970ec055f72
font_02_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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