Malicious PDF — malware analysis report

Static analysis result for SHA-256 5366fbe9c83b6f34…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 03:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93dfda8d63ec31b3f5a9948ddf87ba43 SHA-1: cfca7c752e526946f21fc968538feadcd2fcc208 SHA-256: 5366fbe9c83b6f3466c43cd847b6ebd6b8a747da1dbb6f470a3501955dca1b01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL distribution are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=punctuation+and+capitalization+worksheets+high+school PDF link annotation
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/rabubafijudabefomidojafof.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/74964240917.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/25af81e29f3281ee13ac229922807bd8/jupaziwadume.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a67132ad89e72d3864f3c239d79e5277/73579858955.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/65996767146.pdfIn PDF document text
    • https://securitydm.net/slicice/file/70465295525.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/36888939769.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/08c97fb6f74d95c018e28116a029bb6b/74513937312.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/wuronatu.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/28554686510.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/42398080884.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/78329793440.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/tubunizefubexa.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/vitazoviwezafumaga.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/senuwowufofurom.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/zarurevugetaziwokijopi.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/dozan.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/xebalavutew.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/8436949362.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/76445320500.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a339a5c4866---35921707817.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/lokezetowed.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_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 11132 bytes
SHA-256: acaccb6b300505077eafa0a144401ce7d319f6dca3677105324a53334049b30b
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 18164 bytes
SHA-256: 4901a891d13fece3f8525b51316e44544f5d512279b13c6b6c7c86f77cc7a2ce