Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3876d9ee5bcc2b…

MALICIOUS

PDF

97.1 KB Created: 2021-07-06 03:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a74af80462e5bfbde09275e1828f06c SHA-1: f738a6a6aec8aa61ba12b0c57c18338d672b39c7 SHA-256: 4c3876d9ee5bcc2bf208889fd672dfe306e52beab14c72c45be22e0a7e3ccef8
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote-support tool. The presence of numerous URLs pointing to compromised CMS upload storage and disposable hosting suggests a link farm designed to host or distribute malicious content. No scripts were extracted, but the overall pattern points to a phishing or social engineering attack aiming to facilitate unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8c66b01bd---443832790.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0bb892a69045a37d571320358f50e4f4/99872703409.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/eabe51a66e51c2741e53b7de90bfd4f2/tosel.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db80da1ff6---dabedixumedis.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/duvutijixubakizoxajosa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b475dabe---nifazikijapitowitagifoxa.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210603165526.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/35tvt0al2fc15gf19dhkdk2lc1/26286115976.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ht7585ic1s5236459ie940p540/85003545460.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607294544f3c0---josutoxuke.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/46338441377.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083943f49145---3802261752.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2jtksdqh275r35ubu6gf8ju1l1/gamilibijuwubomitobozumi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8ce4e49d48b4fb1e74d5f2238d3733b0/xifefuvugebitobekag.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-8/20210508143820113197.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/38118640053.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/63779131407.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vanq67v5a1nkaaqbbg7b5kgv62/gobutumazefig.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/nezet.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/j65plbqke51c861thunql6epf4/zalemugupesezo.pdfIn PDF document text
    • http://aimic.com/userfiles/file/93776637536.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece00c7ffe---59144572269.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/kekimejabelijozoxijosuniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+customize+my+license+plate+in+gta+5PDF 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_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 11240 bytes
SHA-256: b3f200559b093fac5f17a6b14f02de964aa88e3f16eefe57e8732dedcdb23c92
font_02_sfnt_off00014a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A59 17012 bytes
SHA-256: 775823f62c53e18c171b3d7dbcd4986b904c558084c575ee36cb9c08ac03bf3f

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