Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbad28f4323c6db2…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 02:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce73597b211bede52cbb64a5f917f8e0 SHA-1: e03558b709c03d5b0d10cf6a277b9d4dbcfc58cb SHA-256: fbad28f4323c6db29c86a2115a18828408b6b374b67813c8b9f4c08cfc7b68fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://justforjetscatering.com/userfiles/image/files/jubetenibitamo.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ade1d1fd---79556781268.pdfIn PDF document text
    • http://signauction.net/userfiles/file/20563562271.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/7642784317.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/kevasirajotuvisajema.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f754116f---xujajowerosoleku.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109090418213063.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/90029749892.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/91107109632.pdfIn PDF document text
    • http://autovoda.ru/upload/files/9447634229.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/wivabu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/boralobavadakijitafe.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/74114722871.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/nuxizomulevijabamat.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/kumoj.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/63506768429.pdfIn PDF document text
    • https://auto826.com/uploads/files/tomodurunokesed.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/7375852558.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd9fb0ca4b---ruwefugad.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/74533719276.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/58365859345.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/vanamuwetu.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/41975524458.pdfIn PDF document text
    • http://voijin.com/userfiles/files/babori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+naruto+shippuden+ultimate+ninja+storm+4+ppsspp+androidPDF 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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 16516 bytes
SHA-256: 0a10c2dde19f07c5918b8d3fbf9d88e56d5485183ceca6042a4190346c1b4715
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 11052 bytes
SHA-256: 19081b3c7dcde4055692d08b790a3b0cc233f830315c2d0c6789a21bde249259
font_02_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1