Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0800df3929b74bf…

MALICIOUS

PDF

93.2 KB Created: 2021-07-20 00:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0bf09a755e3c9256c510cd39bff1181 SHA-1: 3b1f77e283fe5c264d061cb838eeccf02b079cb9 SHA-256: e0800df3929b74bf78b2f0b95949032e0a147602ffce7f8f8574a26561864a04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae6311209---kivigilopuzilugudud.pdf In PDF document text
    • http://feach.ie/images/uploads/file/74406132730.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/75384773614.pdfIn PDF document text
    • http://omg.su/upload/File/69123086043.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c634479f---jisekejugorowajewenazej.pdfIn PDF document text
    • http://fittbikese.hu/files/file/41205182595.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086594c63b60---kexiposedenupibi.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b466fe42d175ad2285a016c7d89bccd0/dofujizitubapezekez.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3bf410b3---99078302317.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c466a064fbe---89079838659.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/naxitemurag.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/83586057708.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160946fdc3af1f---vugikekuvagavovufen.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/5c5489crnghjkmgpr9lhgprm37/bimevatudedumobofu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3df7caad5f6e99d183d20e1b975975bb/jedenubuwazewagafanu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o75791shag3bsfgst6hlhmna51/relebi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b7c8d261b---tabofedulo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c206598e15---77021291129.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25c8aa38a---6748994091.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/bituxexatuvifufosevunemig.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/fasenifibepogo.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0k2ff1o43r06ep5ag0gmd5t41q/73590322072.pdfIn PDF document text
    • http://falerisztika.hu/tmp/xunusugem.pdfIn PDF document text
    • http://atek-ent.com/upload/file/19136448999.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3a771fffdcf1dbb2bfddc9d9117c42a2/janomifurek.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/1450784986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=periostitis+of+jawPDF 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_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 16232 bytes
SHA-256: e2e3b208e95831b52a8983d2c75f98609596b9f0aee3f51b98ac2e6fb2ec3b8e
font_01_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 10272 bytes
SHA-256: 84b2048615e3d596cc54acf61b08a299b943eed11b81d61eaaff21b9d2b23111
font_02_sfnt_off00014f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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