Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63acb31d365faab…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 23:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 209223f6c74ad0eb23759e8574cb5760 SHA-1: 8f3cb30abda429f4092e747e2ab62b25a010672f SHA-256: c63acb31d365faab1288f0659e05f609221a7b97dc3ecfea9b8c4f0da966f909
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=in+the+arms+of+an+assassin+streaming+vf PDF link annotation
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161490a2699d50---28265062652.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/55367312169.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/15747373312.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/ruleduja.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/29529375912.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/durituk.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/bopolupafadax.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/miwuragex.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7b425fefa0e66e7f86bbc2a8248a5148/zopute.pdfIn PDF document text
    • https://vendax.ro/files/file/fezijiw.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2b0abe4b85ddb086dced32adca6217f2/viduwapefesis.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa798d574d---52798189809.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dedbc852c9---buwejimajujuromuzifi.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/44400963310.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/juburunalefokisunijuxelu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/26655356841.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/valavavufutod.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/1712485152.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/doxavomuborifox.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/94735290392.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/16144cf79e3f8950696cc0a4eba35ed8/42211045501.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/jipumebibuvibotaxikadiga.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/nuzorined.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140d2cc8a4ef---jozazi.pdfIn PDF document text
    • http://client.diffuse.info/files/zusipi.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_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 19572 bytes
SHA-256: 99458633804e99b5a8ffd29f7daa62776b019650b017248ed890c18bb3665562
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 10632 bytes
SHA-256: 4fa1db5bcca28b4918f1ab34fc253e98458cabf1f47b3bdbe75286163c466ada

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