Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbbc46cd3efdace…

MALICIOUS

PDF

84.4 KB Created: 2021-08-11 16:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f84b56447bbc0590030be81159129376 SHA-1: d40f615f1707317db935597dc6ee1d26bd31fcbb SHA-256: ccbbc46cd3efdacef22d52dfb5d5ac1e327173abab7892518b8c09c5a7db0317
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=holt+mcdougal+biology+study+guide+a+answers PDF link annotation
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/34960036601.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/xobafima.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/7393598012.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/sojejawagezemixo.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/201ddb9620a262ffcd04bfc2bcd8414b/wosoxasubulimoxojop.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/il3990ojpvlm1ackplco93pdc5/65640364916.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160727b9dc7c36---4508433097.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/13647902818.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/35726136021.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/miputanumolifuxog.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/12113208975.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/30488192767.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a6d4a144---lamimivokaxolufofav.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/19450973443.pdfIn PDF document text
    • https://badrivishal.com/media/58439702296.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/papig.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a913ca58e5b7edd4df6486d17b8a6ef5/nematedesufi.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/82399270106.pdfIn PDF document text
    • http://coumert.com/images/file/23071697483.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/4a6b87b342dc7cbabf0d710c7ef94f95/sajilujelotep.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/73366061425.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d187b417213---96357027239.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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 16712 bytes
SHA-256: 387371b9a8c5e8d9e02b396facadabb573bcf0eaebf52c6acddd2a94add4e358
font_01_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 11144 bytes
SHA-256: 779dd180a1d871bf176f71a591073b00c1b5cd808af5445d905b4660bd6c5e91

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