Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8e5aff18276059…

MALICIOUS

PDF

72.3 KB Created: 2021-08-30 15:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1af00f5192961dec74c97f6c61f02c44 SHA-1: 1f373a41e793c2cf36e34621e4df31950389308f SHA-256: 2b8e5aff18276059c2e203c6fb2e8aba2d0d378a485972526941aefdb1beaf67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://manavpublicschool.org/manav/userfiles/file/zawagexam.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d44bd0fb428e64b0ac48def2cedfcc0f/77669346654.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/kipixufipirixagawamevix.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b8809d5c9119093a0acc2e76248ef39e/90729321102.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/zenedazewog.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/13949415796.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/turuzubizapusejabevepa.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rsa0634nv28r67sb16t5fmsg9k/koberobibolepewojatar.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/40611381217.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/bafafapupisitiminagutilef.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/dadujorakafeli.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/20771333383.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/4548957916.pdfIn PDF document text
    • http://aquatherm-graz.at/files/35291370823.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb6883f2d---87598022653.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/49245741261.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/58387859448.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b72c5457033---84276883929.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/xudobobubepusasupulenovit.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/tepaji.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/24c550620235ab5eb216b347a395790f/kekakesevorutupomunexifa.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2186326b128095db49f567c5efc6fa7c/kowadolidirupidorafanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ftp+over+tls+is+not+enabledPDF 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_off0000b2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F3 19136 bytes
SHA-256: a767c7712ecb23d1b137af4c19c2c513500a49397535d6b280f5cc8d09f423c8
font_01_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 10568 bytes
SHA-256: 5f1e6efc67d66c17163deb07739ac3ec22cd9b7c72b2339b03177de58e710a17
font_02_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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