Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ba2c9a9a2acb6f…

MALICIOUS

PDF

87.1 KB Created: 2021-10-11 10:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e32c95472530ca8c685387549f73ae2 SHA-1: eb4c6e51749e12b210c0b1a47f116034250675ca SHA-256: 02ba2c9a9a2acb6fbf268bca00feef354e72074ca4f54896e28ae18d1ed1bc7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or redirection scheme to deliver further payloads. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://macauroommate.com/ckfinder/userfiles/files/fevol.pdf In PDF document text
    • http://www.niceresidence.net/image/upload/File/butegumemufo.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/35206769434.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/41629286242.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/54582376366.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d85f276d1---fezatevodotav.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/mobupepije.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20211009162811314700260.pdfIn PDF document text
    • http://dhf-china.com/d/files/zoxafemoserusaluwe.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210929003704.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/98562155194.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/bowogodapol.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/lobuvukeb.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/muvimofomad.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210929/16328869943601.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a06c766421---malirisakix.pdfIn PDF document text
    • https://stormester.no/files/file/22033201309.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d411414816---lozowovusuvapowegi.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6156ce161d45b.pdfIn PDF document text
    • https://lhdgv.ca/lpch2010/userfiles/file/fikimuxaxuda.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/eeqvcrq1obi4it3ma35il45m43/39954143925.pdfIn PDF document text
    • http://inphilong.com/upload/files/wenepusisemedowot.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/nosemen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+change+background+colour+on+powerpointPDF 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_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 18396 bytes
SHA-256: 81bfa18a2e50284240c764dcd8c2e13d08baf878a20aa4e68b821f50ec82fa58
font_01_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001351f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351F 11036 bytes
SHA-256: 88fcb0b21b28153376c969d533f68e46b2135abb682dc2a1bdf49d58e4547d85

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