Malicious PDF — malware analysis report

Static analysis result for SHA-256 723f37704c3fc278…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 09:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 693310ee273108675890ae2c6999a125 SHA-1: d9b0a713c56611d01114299947217cdb4a42f362 SHA-256: 723f37704c3fc2782dc28adaaa6d7454ee593e6fc66dd2f1afa78ae8235b7892
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://domilot.com/uploader/files/bojafuxizamovirigeni.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7fe7a5451---sabekumijadifemozozuxiwak.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108301318407612.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/fogavaruxowi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/df2c2568b2184e5d0cacdfd212ff1e78/gupiloxitemarunu.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/28264433556.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/efeac3004846b3427639b967ac27cd4f/80562141533.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be882da290c---21907180267.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/45346995381.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19041344300.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/xapoforedaja.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/tiwurakemalexadox.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2ba2156a---mejekevetesiwuvinonotapu.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/bapowuxupurumo.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/vexixedodaba.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102e8a953e24---xelixizegevepepiginula.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/71882708218.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/bowiroje.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/repape.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/fifuripuxo.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/87332011218.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/mixumob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=neural+networks+ai+pdfPDF 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_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 10748 bytes
SHA-256: 1b761d5d12b13f42ac4f597a2e000762f62704c9bca185b62bb09722a0592aa8
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 17640 bytes
SHA-256: 942af5462a59ca63545fcb86c71d2f85f50dc7ec5de828df1d66b2282d7f9999

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