Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2cb32023c58099…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 23:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f05b108b6db998822f87e44cbdf0b4b2 SHA-1: 2064251ad262e9dcb54a0320b1e6d04aeeb1ffb7 SHA-256: 9a2cb32023c5809996c2ef7cd94abe7281cc2acde27d03e9d287e2d4615475b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous links pointing to compromised WordPress uploads and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://staractivecollection.com/resimler/site/files/68907555447.pdf In PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/37493534891.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/1a81b3a392cf2f4b663506854308990f/wizoxefaxo.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/13086608635.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607830e82ec0a---wasesobomivukitexapofoxem.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/zidakedalatop.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160876118e5803---nazebosite.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17c7cac4b8---45508176449.pdfIn PDF document text
    • http://garderoba.sk/images/_file/rinobugedomidewojupe.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e25ba0cba---23107640621.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8968201745---63532348785.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/38338734496.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kakizepagube.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/bodakudujomikazirokano.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/59518882049.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f4a005096461203fcde27aa93c74ad1e/46722086075.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/14154625208.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eb632979---supelasusudalusexaxodoziz.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/zawenefajobesasolalu.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///xotofekupiximutesiwenidaj.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/45768164710.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/817360182.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078d65abb2cc---dabajitexif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mtech+and+btechPDF 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_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 10072 bytes
SHA-256: eba2bbe732f663a20f7f40fd3918eff24a81a58b1645a3a2b205dedd44600d8d
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 17500 bytes
SHA-256: f67aea0ceaf8b900113f62991e35d0782e2ad7eb247daa8c45fdd84e36a74904

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