Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c3134ffd5752df…

MALICIOUS

PDF

98.8 KB Created: 2021-06-30 08:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 581550d41edf9182cfdef6eaa5f10b5c SHA-1: 40c93798f53a51675a72f83532dedaad79f041f1 SHA-256: a0c3134ffd5752dfe159313204cc92237c527fa2b6180d61e8fcbb1e3de60794
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c97b250d8a.pdf In PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/nkicq8ttu765nl306nkq3angr3/6948223726.pdfIn PDF document text
    • http://mebco.ru/images/file/27691387950.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1c92b2efa---tilajo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5f5460c7a967363824581befc1135629/topalotave.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c191002e6d9792d15003555fd22534fc/73046987395.pdfIn PDF document text
    • http://farmina.ru/uploads/files/84401424437.pdfIn PDF document text
    • https://webmenuplus.com/images/file/mizejutunojolelut.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c39331c207eeb3cb24f21877b3cf5c8/lijetaxomesemuvopamolanun.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/jotugolotape.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0bad1187ec0950d0bae757e29163d230/44398435930.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/576afc0af64ebf8fd8388881031d41e5/69849934836.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54d296ae0---55756160707.pdfIn PDF document text
    • http://com123.vn/uploads/file/75862540129.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840bf34c21e---28358559837.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b7de5048bcd1105b41fb83cf1c1d622d/janol.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/rofesojasewuwodoledir.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d735e33e1b9---fajilelaxawaj.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a325589269d---80689651035.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/josidobamivol.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/15044182542.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/55f216b297d24585e8fb495c9ac272ff/bujomatilikazes.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/ruzufo.pdfIn PDF document text
    • https://daismene.it/file/50924550164.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa3e5c93a---49896963131.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/r1s68mpmkft7pqm0hdorb5qqol/30780275730.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/74302224263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+write+a+thesis+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_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 10520 bytes
SHA-256: b7d7b0f3886029b33c2cf4c323cd97c741d52b343a86baf2151044d1fc2c7846
font_01_sfnt_off00013622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E34 18000 bytes
SHA-256: 6715f144529479f7c4b84692055d84c921b7e8b33237663645f8bca760a6a050

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