Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2485faed0e08e4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 07:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 45519ed602f72cdec67d6b586f9b04f9 SHA-1: 7e3302e62731eb1d25d5ea243916ce42a4bb7217 SHA-256: 2c2485faed0e08e4432e6d3456a0b13c4fc2b785c2ccfee3b1659ffb77e04c0b
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=babybjorn+cradle+manual PDF link annotation
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160911cb7e390b---gizabubuledafisovigazuse.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062904203146.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/59499594927.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/28562786951.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/2746459146.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca1983f08---51076018850.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ca26b7f3223a303dbfe3110c50a54193/82233616830.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5ht9nhsumgf4oonmhdq2bvt7p/nuwural.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/58586338456.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e98bc10777---18580734675.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3e6d5027---gijavekodiropikaf.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/5456595059.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/34131347149.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9ljo314ec87lcrff8jfdlk2a13/lebivisigulakepafofado.pdfIn PDF document text
    • http://gtshotel.it/images/file/3572250478.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/zupiso.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/97075761944.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad9be443f---gunurewofijujonivopupupiv.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ca738a0e18d6a1fff0b730eada0a0857/78071097471.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/2904065188.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/xusinanadopoj.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/vanabexatuj.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/71331030048.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/didilapuzarokegeza.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_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 10712 bytes
SHA-256: 02dd85729b62277e9e814a8d963ba2cab8281f3e97e22125c0f4af61d5ef8fa4
font_01_sfnt_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 18100 bytes
SHA-256: e81a6939788ee4c83ba2c6805db219f518a44cff28b59df76f957542960fab41
font_02_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1