Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef68fb66addc28ae…

MALICIOUS

PDF

90.6 KB Created: 2021-07-17 01:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 53b418a33e6efee4a2ab646a3c3dc94a SHA-1: eb0cc1b8a01f72181da88e1c385a9d4c70dfbd62 SHA-256: ef68fb66addc28ae673dfa564f2b581e5a3415a16af84b2402441c5286f12fce
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, preventing further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/076c23f6a1cdbc98c26cc36641fa63d5/nisedonasawajuj.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d1b9a8e1---11163405718.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c463d2d2988---mosuw.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210622232627161989.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/savawolumaxo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/sjkjmnuspbgked1jfl87bp1n9l/lowusuxamadakoxiguduxozu.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/setafebobukuzapavutap.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/af3b0e76d8460f910fe62ee873640f3a/2012368796.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/7557537484.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/23059293916.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/97602500034.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2b03218be---xubatos.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/7h01kt1fsnoude0k43g3mp3php/52171210378.pdfIn PDF document text
    • https://samowar.me/userfiles/files/78428393949.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/97824206230.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/pomorebevowivusoteremidez.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/36973662306.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/423f7e17c6779b144ef9d3af9cfbb3fd/57584196444.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/kemipigolexeb.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c00f0be16d1---11066965385.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3d7ab08f7---55168313529.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b657c3f4202---javufowa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/52fb5591f858f5fd8c6e00441e0398b7/bunobapaluteruziwu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096561186b5e---38400891688.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/09753e912d60a522c9a534ca852de340/voxefelupunajilol.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/jasurinokopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=prove+aas+congruence+theoremPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 17392 bytes
SHA-256: 7fd4d6101ce23eba194d08a14be7f82eaa55d047dd420a292d87830b9f1b0152
font_02_sfnt_off00012e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 10708 bytes
SHA-256: 02a87618153cfc50311b87907092a016458fa915fb5cf48bbe62021d6eb2682c
font_03_sfnt_off00014713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14713 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29