Malicious PDF — malware analysis report

Static analysis result for SHA-256 7837c24109782654…

MALICIOUS

PDF

90.1 KB Created: 2021-08-02 01:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb2454e7f5def6cc6e010042352d196f SHA-1: 76aaa74e8e4cca95bb3ff8b4ff8a466c09670af3 SHA-256: 7837c24109782654c0e9bf1b9806d4131de2e914e2b1c3becdf4be8a26458bc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDF files hosted on compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae5dc7a1f---45768604058.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a2ab60be6c3d791733dd6ef755d03018/31524708561.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7a7182bb713a0f98d90ba5e12251614c/kilavemedasi.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/mirazagoxite.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/81959548094.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/divag.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fetirewaleforovarowezizi.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/xarewifusetilu.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/6710262310.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c305a304---24407709911.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/degakukozivigoguwijejag.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4865c758b5---gusemudoju.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/80767929093.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/wulepe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/79029906641.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7495885441473cd1decdaff27c041261/11127418155.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/54035540098.pdfIn PDF document text
    • http://mths1965.com/clients/6/62/626de2090e8268457c7577d5e8b87900/File/kebibo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaddad11d1d---92702785160.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tsnc19mdatcnr9s8ed52ut4701/49991427573.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/q8n7ak1qleus9fl8mekut2pssm/71516117277.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/vuvigusipitiwuresit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+the+coolest+boy+namesPDF 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_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 16912 bytes
SHA-256: 7119f6171654e9f5334d5270492b0e27dfdf54ade40e6fcf8a2edd501699c95c
font_01_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 10652 bytes
SHA-256: 03a690d2268960e87ae64d4b29694c13f2f359a97744acf48d0f97e648594d60
font_02_sfnt_off00014165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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