Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a635c13507b3345…

MALICIOUS

PDF

102.2 KB Created: 2021-07-23 01:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0029254ccc34e2cebcc18ab18e1bf4cc SHA-1: 6f4c6e131266c9e88f772b238f471dc08d108812 SHA-256: 6a635c13507b3345f141179a153ede0771d7777ec90420407587d18c60b4de57
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick the user into taking action, likely by downloading the linked malicious PDF. The presence of numerous links to external PDF files, many hosted on potentially compromised or disposable domains, further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/31357e866ca61a5acf61df0aeab1dc92/96556680386.pdf In PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/rozutixewetoriligefakaxet.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/xanamilidekikatosu.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/vatev.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df987d2146b---ziboguf.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0febbc3db3---dududolisomebetaridot.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071587904c52---10662512271.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/jamigoselan.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rewadel.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2cd4d6cf96f5adb77a4cf7e0dbce8ca1/54449419030.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/87851084447.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/65652314708.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d4e241d9---magibemivijowapake.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94e2afed8---62524578231.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f3897ac191abc6d3af1945e3bbc04bd1/xudorevofejen.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30492566384.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/zalojofuxu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/94e90fa3481084df68424c2374144208/kejimuw.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/cf0bc1e35a8ffb1009909ef2b7e97a00/8408037178.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/mopulak.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/lipepad.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c726a4ccae7---bigadupixobekaraputo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5eb4e0e36ad4339be7c2711eb2ec7e06/tajanugegobozopokamesiwu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f40bc8046---polavom.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5010cc5f99---56895052612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=startup+business+canvasPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 10580 bytes
SHA-256: 9f3f610e443324b5ed98fe77ed86a9412ba94f130d41508e12c4519215cd4150
font_01_sfnt_off00014545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14545 16856 bytes
SHA-256: 9bbcd91016855aa5b1813c7df3adb29f475220029e6adf02761214d927e8b2af
font_02_sfnt_off00017136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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