Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d0d48dbfded441…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 14:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9c63f774b2805d96cf9482fc15a1289 SHA-1: 9d475aea90b48d486abd0b9056b5d04778402618 SHA-256: 83d0d48dbfded441f4b37d2ce77c440f3b89ec7ffdfb667dc5688f870fba26b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://coretry.ru/uplcv?utm_term=dremel+3000+manuale+istruzioni PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e2d857136---41288696437.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/26472654065.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/unt4lfad7u6nb15fsgo8k8i5qt/kojisezaliwusote.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160825f082ab36---95330968265.pdfIn PDF document text
    • http://grabnerestriche.at/riraribiwogekep.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110510d86e33---40831111038.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kusogudilipidoginetajuk.pdfIn PDF document text
    • http://15881588.com/ckupload/files/63141772374.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493377170b---radegexuximekekinake.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/2628d84d00c4ab1e86bd43e60eec9ee5/japoxawidubow.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fff79ad0f51---janakob.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0de9035d7---jibuwizew.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/doxuwubu.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/zobupugajix.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608864139b2be---fosikuxafetirixituribagid.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-16-20-12-46-AN2DRqJV.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/48155690250.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/sisidunilefetugasamopinu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e6524a5770deee36e1125e90d20bbe78/fubidibirufeketiji.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/69463217484.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/75341303490.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/jidanomigosubajexiwesiz.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e1664887836076d655e9804111c21a3e/2878945506.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20218232159179979.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_off0000cb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 19520 bytes
SHA-256: cce58f9746ee4c667a16d7ca6fa43560a3d3cfa635319f91454816ab92918096
font_01_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 10724 bytes
SHA-256: deac8d61f000c6cd4b1122b2782abb45ed74a4a22591a60892feef721f0ac597
font_02_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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