Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d7f4e44f5ce367…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 22:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54c9f7ec9d92d9edf515e0830b3168d1 SHA-1: 9f698872ecdf7468033b14096f90c71503e4c391 SHA-256: c2d7f4e44f5ce3676e1fc0cff26e00ede6273b44900e7a27e8d4527e27ca0835
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and a link farm structure indicates a likely intent to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://okinawa4d.com/contents//files/11034065057.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e02e86840---kaliruvurubewazigazu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zifajafirokoxaba.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/soxebutotetid.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/887e092d6812f624db5e5fee3e792356/nimutujuwokatavas.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5db4c8dcb7028d5d7004f9c0f36c90e9/mulowunuroliwozo.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3f9a8e21---60031282405.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/vafevenimoxexupowavo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d05493f551---sepofip.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/62432876280.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/niweti.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/wubozuxesudiwifigumu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a95bd4d93f8---15474978610.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/fimavuwurafebo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c32f1085f---13027577544.pdfIn PDF document text
    • https://songhongresort.com/img/files/dumatox.pdfIn PDF document text
    • http://lukinserv.hu/file/76919168343.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4998808cd59494aa1c342b0a7bc17982/3090365733.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ed219968---jujofolakabekevurirujala.pdfIn PDF document text
    • http://altinay-law.com/images/file/joluzufotapolupapuz.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/guvetofoxabumufuk.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/81132975754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=houghton+mifflin+social+studies+grade+4+practice+book+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_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 11468 bytes
SHA-256: 8f5f1982984e1bc8862186950ffc3b0deb24ea492106c595a7837ed226a061b2
font_01_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 16860 bytes
SHA-256: c3e8b3a804ebaf3173c13427dc26314787a493ecd6cccfa225d2ee0e947316c9

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