Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf14d952cd4dda7…

MALICIOUS

PDF

92.9 KB Created: 2021-06-28 19:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d6a8318270e9d2be835febbf1e3abc7e SHA-1: 126cd9c652676f618e8f320b017336230c5f3e4b SHA-256: 4bf14d952cd4dda7c754ba4071d0a107d63646b0c36fa5768ca2a116237cab41
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting further PDF files, suggesting a multi-stage infection or phishing campaign. The primary attack pattern involves directing users to these compromised sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6d0477d10b2179c5939bc56666451f28/36562812842.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e0cbbab78daf043bbbefccebc8749083/manowetiduw.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/743444cc467acacdb128109ae7a89ab5/22218409933.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c3ac980f---50194245472.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac091879e83---bukenomuvanimozonuzomi.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/f5fe044b0913b9f4691b068731af2a0c/13770127084.pdfIn PDF document text
    • https://luminex.pl/upload/file/nasilafaganov.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/76a3f5c7b0c0088bbb9f5e9c6f34fad7/45069826619.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/79393658215.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c040223c---97038238571.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/beturileda.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926abfa45e7---56965747249.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/xajalagonaf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gndolcp0s4nb3kij413slj8ot1/74166795473.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5efb8962---95871518891.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/8837084079.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/t6kqllqg87ciiuv70920tqlh60/figedivutibogunizane.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b94f614ea---1872110316.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/widemasebinuz.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a820dd7af---59179471804.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/vomakulameni.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/xiwufulopemixedejibomu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea40061834---27113054650.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a29162466a3---88426193021.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/fufipumoxusunejatodo.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/kuguvezogu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49e3d270b---bodipesurosawepat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tropical+rainforest+meaningPDF 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_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 17496 bytes
SHA-256: ebcee745094b055f05c1a89e299ede71a74ab3480917b990265e44d25db8fe42
font_01_sfnt_off00013577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8E 10784 bytes
SHA-256: b03e5dc73c0a54a22c037a98844fa23411b41bdd2bf6b618e3a374b3e9a0c9e3

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