Malicious PDF — malware analysis report

Static analysis result for SHA-256 f384614ae0063065…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 11:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dff0c734a9f1acc677b147e6398a1e85 SHA-1: 151a6048fc2d938a28d69a9cdec2db924c477a85 SHA-256: f384614ae006306502044bf8df5d408e590c0b55cbceec3f72f71c8451145c2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to external PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5f2aa505254bcfad25900268e29ac121/gulenalafogezoba.pdf In PDF document text
    • http://shosholoza.de/file/sujinazokexisobumez.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/buvevinijuporivepewil.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/96295013512.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/57376770353.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb5f34dcb---63473450933.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/33125291421.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c7114f80bd1bb75c5882db509b789ce8/56961846706.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/govomavezupu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/fuduno.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae514874a3c---28499072228.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07b2b8d56---48487908552.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/94031735539.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26678a0d6---95285056701.pdfIn PDF document text
    • http://charivne.info/images/file/26287162268.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/niduxatorajomopajife.pdfIn PDF document text
    • http://oodow.cn/upload/file/210702111234065789h66fv78a6knz.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/69017192898.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/67734343911.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ed7157d913b3d76ed1a82408009db54c/24923086257.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/sanumokotenoj.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/676460569.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/wukedatovabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=culligan+medallist+installation+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_off0000b77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77F 10620 bytes
SHA-256: 684f3fb829104729e03d340ea673ff3fe6d0893835d5fcd748dd33884a6099a9
font_01_sfnt_off0000cf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 15684 bytes
SHA-256: 639d948236c3f342ba2918297560d83f1f0abfcfd60ffb2d620a7c97b96bd990
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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