Malicious PDF — malware analysis report

Static analysis result for SHA-256 848a80e82a622fa4…

MALICIOUS

PDF

89.9 KB Created: 2021-08-13 15:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db4f0c34f07b35e107ce105d61a1f317 SHA-1: 1fd8016c1bbd3fdb3ffca9b056bd74e0dd854fd7 SHA-256: 848a80e82a622fa4d6e2288e72d7957a21c44500e798597d4e1e0db69a09014b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document's structure and the nature of the linked URLs align with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5adf6c7f23---jeradosujibojave.pdf In PDF document text
    • https://abeess.com/userfiles/file/tokovodulirumumi.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/45028715241.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4091dd704---ribudutavagozubawajizi.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/f22g1itlpgnvgmjc57p2ee53ng/rafovegogufomukijebijag.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/338706091.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35a44e859---35040014566.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/muvarobowikuti.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/76083879653.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/39300759442.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/74580006719.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab13bc4e81---tapuv.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a8a26705fc4f996e3dfafeed061eaea2/40120248074.pdfIn PDF document text
    • http://dalaichau.com/files/5128937897.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/69977956961.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071e852679c7---42013810241.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lakbtgifm09c1rq62t0901jpv0/noxuximawazitagululawa.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0db5e5eb27eb1cc244b52cdfcff34750/sazifopexunodusase.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/oekk2oqd080a09ue7mmfdv60n2/63695855360.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/68030662363.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/5l3mrsr3tjgqi62t005vdal7s2/21214135457.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/jarolimawejasagigurevogan.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/76557619890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=entrepreneurship+and+small+business+management+assignment+pdfPDF 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_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 17000 bytes
SHA-256: 6c9ef1d92c02617dc66e066f41defbe667382092ba6e6ef9a0c40dd2349b4f66
font_01_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 11048 bytes
SHA-256: 55b91e5fc1a521c3e809463efd8bd0b727e3d60ad604648677b7b78a36f8ef9f
font_02_sfnt_off00014064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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