Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cb1ab73089eb5f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 18:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ed4cf8a9c988597065e8083abf7dd4f SHA-1: 97282739236ba7a8bbea136b3756389d72be8720 SHA-256: 21cb1ab73089eb5f33d5b4c4325f93ab078455d7a340e94dff4e8fc43cd2a5f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on different hosts, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://organicfertilizerproduction.com/d/files/tavudopebuv.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///92819908497.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3f30de23b---zanugogofikad.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/woperawosinivi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xedoruzivepi.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/43425662039.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070802542130.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/16597091355.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0f183a813d1db95348dcb3ac88acf24e/5495341716.pdfIn PDF document text
    • https://amblamy.ee/upload/file/kawinekinoforexiretowozo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/52f7abdbac5c761754e9ee1bb6c576fc/rutidazodafejojadonifofo.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/rofivaxixi.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/e7ullk747lilioo4ojgevtfq3s/48046905764.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a704c6058ae---95044402242.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/sanexerowakepis.pdfIn PDF document text
    • https://blugarden.eu/file/12042802402.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/bikixolegalugi.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/12855980305.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81664a590---23365402315.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81ca1f857---11065568479.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/sebigome.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/heu4rjd1d05l2ge4cstd5dk4aq/sazolotuwusosuron.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1bae28e6c---84209337120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=o+lord+you%27re+beautiful+chords+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_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 18452 bytes
SHA-256: 299005b069650d09469bc936219894a223e8ffa45c36d20704a058e2398a715e
font_01_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 11028 bytes
SHA-256: 5584fe8e43443c218406a2f14896773db5e492e7c3ff451222bd28a00a99c05a
font_02_sfnt_off00013d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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