Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac508c1efe9ccc4e…

MALICIOUS

PDF

87.6 KB Created: 2021-08-18 13:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 08207eb2d094682d60dd7a08dc42014e SHA-1: 3b9f973434a05a326dd7a03ad248799429e3dd9d SHA-256: ac508c1efe9ccc4ec1972b299bbdc77a92837609679ec3f4a47777c068bcad68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://koreanhotpot.com/uploads/files/jatiragorative.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca65a36fdf---vutawumimeji.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/63840549315.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/midasededataregiwavabof.pdfIn PDF document text
    • http://simonide.org/userfiles/file/desomilotibarekenekisi.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/ninovanizajajosufu.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/zuwifisapuligulifowifekag.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/zamaxuwom.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160762409a7fac---novinovavi.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/lenometilomavig.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/62320202a9dad495f1e9535a775dbb94/wawojoxadusudalezi.pdfIn PDF document text
    • http://mesterek.net/tmp/fasofa.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/lekovogelepup.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8b790979---pomab.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a5ad62dd---vobis.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b509ba614c---pexubotokiw.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/tonamumuwosuzakapubek.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/juduzulisawiguwomobobelez.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/vavuvitikujalogalidiloz.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/6e5c6675342459648d8653213d9fcb19/18587961242.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/vumava.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/wogevuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+study+for+permit+test+azPDF 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_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 17184 bytes
SHA-256: fdb9f79643cc4569ba54cd35b54c54a2f745bf731a4daf851de8f715f3426b8a
font_01_sfnt_off00011ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 10860 bytes
SHA-256: 01d3b89561f9f58b4a2505cb6bb715298977009c5d84a0efc259b928a0e5e516
font_02_sfnt_off000137fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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