Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51522284bc09f5a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 10:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e023f1c18b62c3ef3ddc865754f24b00 SHA-1: 90c65cd9fc3228123209963e1114cd077897ad88 SHA-256: b51522284bc09f5a87e2387c296700ff84d87a7929cd3a1fc509c4a496675dbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with a critical detection of 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is often used to execute malicious actions within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads, suggesting an attempt to obscure the final malicious destination and potentially distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db288b38eee---57483455685.pdf In PDF document text
    • https://betalinktech.com/blmedia/file/temanalanifomewituxu.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/rufoleguberifo.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/37687714869.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/zegenexevazoviragarivora.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rojawelaxefirakexoxi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7bdc27384e1f1cfaf630fdf718555086/50673204297.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/16424950748.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607556477c50d---65302836094.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/87233355785.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f037386ab9d22b584867c1e67da37a44/sisonuk.pdfIn PDF document text
    • https://sce.tw/uploads/files/60f4459966600.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/556824510.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/medivepitetinoveloruta.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e268d370---67951594902.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b24be33cfe6---94520962467.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a1e4987410df91761934c3c87081d414/pukofazufurivoxovewogo.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/boxomegifegabatesadazoxo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06de30ce5---5491012291.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071982a6ef5e---kamakederenumesaleno.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec43771d12---13433003582.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/feratogoduvafasivelamew.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/mikifozedokerawesafusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kuhn+power+harrow+manualPDF 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_off0000c5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EC 17412 bytes
SHA-256: d7d6e4d3e13e1a7dd38026ad0f84ac45e661afde7736530e933945abbe90b27c
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10336 bytes
SHA-256: f801e892830b764c87c09e48c1ae630b6e621af87f29b7e5a45be3b15942a166
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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