Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec255eef84dd6173…

MALICIOUS

PDF

83.0 KB Created: 2021-08-17 12:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca2c7a5eedbea3e69b707156c5200914 SHA-1: 1acb874af42a9e317d6b8dc3e9fec85a71e3c5a3 SHA-256: ec255eef84dd61735cec5e52e529659409e995cc3ce2a7e6f9fc922233b1dd87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or initiating malicious actions. The presence of numerous external links, many pointing to compromised WordPress sites, suggests a phishing or credential harvesting attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090405931b50---ginebata.pdf
    • http://rotarylaspalmas.org/documentos/file/97980564835.pdf
    • http://asfus.net/virgsurv/userfiles/file/sowafofevewanolenez.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/00e9385ad9d9e64195f93a0683acdef9/ravixibazenukarufoj.pdf
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/56977724519.pdf
    • http://m3hotels.com/userfiles/file/sebutexemogononazemi.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/gasaramubepojafap.pdf
    • http://planet-for-events.de/userfiles/file/zinuvakexubov.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kavlfm5ncgsn5kgi743ovmuq42/82993558370.pdf
    • http://dzbnf.com/upload/file///70581688953.pdf
    • http://ajarnveerapong.com/UserFiles/file/31886351843.pdf
    • http://architettosbaffo.com/userfiles/files/12353015834.pdf
    • http://a1-automotivegroup.com/upload/files/zibetapagozedober.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4b2975087ca77c28eb2cfbccff0d5c0a/zigarizededexunemejaniko.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f701b32664---kewaserexime.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0f582c07---lujeturevixamokoka.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c886c0a1bc9---43016413288.pdf
    • https://hagakure.by/upload/editor/files/nimimiduwileguwox.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096133b0a759---dobeb.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/v5p5j64e695qgji23co9ek7i20/27461252545.pdf
    • http://papinchess.ru/userfiles/file/38338886785.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee6cceef0---fubolujaji.pdf
    • https://siroyensao.com/upload/files/potemomidobokib.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4456c380fdcd84c456fb2ad62b1b55ab/kajozedavuxume.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=georgia+guidestones+chinese+text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0df.bin
f1eaa817aa33b5597cd368b082efc4b1ffe80e95181898794cadfee8d4a87594
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16960 bytes
font_01_sfnt_off00010cbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 16792 bytes
font_02_sfnt_off000124d5.bin
1c6b0b9f1be531af9adc4cc9342a2d91941cd423a6501b9c8006cc059016c2a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 10844 bytes