Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea90cebb24bc6ee9…

MALICIOUS

PDF

87.6 KB Created: 2021-07-21 23:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b23c91651d19ccfb0ae30a09574c325 SHA-1: 1e6b7f7124391a3535421d7ee51e0e084e00e22f SHA-256: ea90cebb24bc6ee9a4d40e4f0cc47048d5dd354030f6fa8b4f46c49b323acc85
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall detection pattern indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/78dd7ef61ad88d56532d8ffdb53c00c7/sofudukiwevigelijilar.pdf In PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/25900386667.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/fojeloworezetupozet.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/09a0485501dd52829ecfd2e5cdca817c/jejavo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/mt765hrtt6l94766r3uftmhsc5/30038720481.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8560b89fb0---xenabolulamuzilujezuwaro.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/zusabafewulaxona.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/mupapobe.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/zinesutujadejatibivukajap.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71504650538.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e374f300a---wizonupoxetetofi.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/69560165113.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b839a23f8---60964480650.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087dddae3dd6---gasupegixo.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/54231683107.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/mepamo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/18v5nr97orgscjg8rlcbu5ckfa/pawufanowe.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a173bcb4f5d---55156130571.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b79326ae2cf---woxotujejebugezusezena.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02b351dd6---nurejosepatajefida.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ajieaivpb9q3oib6dfe6fmsirv/228925835.pdfIn PDF document text
    • http://minhanh.com/files/surifemigin.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501211558598842.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dqlfma82il4ki70ikf1mohvv36/ludori.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/3884462520.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ec9def22---zusan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kgf+chapter+1+download+1080pPDF 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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 11100 bytes
SHA-256: 4a739b49eabb5deac0f42a508fc2d873a467c15ce34fb07bca9ad0a7b8885380
font_01_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_02_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 17736 bytes
SHA-256: 493d901fa75df13baf0114dd52df5098e2bd9c5b74c18ab28ea710758916e02d
font_03_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1