Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd6386374bb262f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 11:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 520ee601354c10c2a2306cd604eced86 SHA-1: 8a690fc8c24c8519fa61f7ca44d7aa514b6031c9 SHA-256: dfd6386374bb262f045458b7cda814531136b4da15d47c274c46514fe4842f79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=kuroyama+diamond+generator PDF link annotation
    • http://protezas.lt/i/File/84258955294.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/jexobosorejegituj.pdfIn PDF document text
    • http://stringladies.cz/userfiles/39316276232.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/34496604284.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/13256432298.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/61649090921.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/28795997514.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137afe1440d4---sijupifemapipesujani.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/10216850280.pdfIn PDF document text
    • https://polytex.de/sites/default/files/85298937084.pdfIn PDF document text
    • http://robedecreateur.com/img/files/99158700238.pdfIn PDF document text
    • http://vititanon.com/user_img/files/mupuxokawofejeximak.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210901_005034.pdfIn PDF document text
    • http://www.andreapondika.cz/file/68895712815.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/82179978901.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb6d7fb98---32937452572.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/92516890353.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/35116541615.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/56841403091.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0b0360b30ed09f1bf8b6dbf2709db050/3051023476.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedd8e1df2---23221261034.pdfIn PDF document text
    • https://podimercrm.com/img/files/75809645944.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/62765654359.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_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 10580 bytes
SHA-256: 0fcfbaacbdfdaf0769450bcfb6454fdefe29d4da95ee33f9e13bfdcdf2a7af07
font_01_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 17164 bytes
SHA-256: 48c106e82dd65fc95ea54bfa419f423e717c05fbe6749e979ade6a9c004cca53
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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