Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a8f20d62b82ea0…

MALICIOUS

PDF

107.2 KB Created: 2021-08-17 19:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48fc953e13c779476660ac5e7a978d9c SHA-1: 109947c9032ba1f2dfbdfdbce54af4fe39077d30 SHA-256: e3a8f20d62b82ea0713ab01fb59d2e844d52bd64dd5b146f96a82bdf07c3cf5e
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links pointing to compromised WordPress installations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to serve a secondary payload or phishing content. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31b9936e3---mukodapudewidalu.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160744d15063ac---soxovemi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a684b9bc9---43466252640.pdfIn PDF document text
    • http://ippon.lv/uploads/File/dazepefupobametepewepanu.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/24224999967.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8dc0bfb7ee2e207bf77cbd529a895c8b/duvakuxiveper.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/85581236706.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/dupexusolopu.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/12603562547.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cabe0b2bb---getajetasizos.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089290d7c9fe---65298465887.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60E6022CDE453.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/winajofudisujatorajo.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/laqbdfgfhv8gbfeg3282i1aaf3/52718271554.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/15d3af2f8af124ea776f0543b7cd12b5/sikepinuli.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/takanakoxoja.pdfIn PDF document text
    • https://lasanisports.com/files/48495762352.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/72617671905.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gepeduxezapad.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/1268065456.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49737746671.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nepepujowevuloresube.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/on0klttltdb9v4ffl69cssnjk6/53930472945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=build+bob+beck+zapper+drPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/repiralefubariwiwaxuxuwew.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_off00013e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E44 10584 bytes
SHA-256: 3d002c4be36b2f3473f4976eee2dbcacbb96a4d405bdb56049aeafd179119373
font_01_sfnt_off0001564b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564B 17788 bytes
SHA-256: 4b7c276277949612a3b99ad6c0746bf2d80633cefbcb9420c192ba3bff9ae469
font_02_sfnt_off0001848c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1848C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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