Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edfe05963181eee…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 11:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 940b4defb0e9374c3e39a3960a90597d SHA-1: bb30845b4047980da31826e0ed9d2de05bc268e9 SHA-256: 8edfe05963181eee27c603f7b0cacd7c7ea2d705c6869cdf0246bce87f42abd8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains identified as disposable or compromised, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it may exploit PDF vulnerabilities or serve as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://beachhigh65.com/clients/879402/File/tawitodulijojagit.pdf In PDF document text
    • http://tunglamgarden.com/images/fck/file/segomemozoniwodadu.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/luwijor.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021522628525707.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073f16dc77f9---22523297676.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/zaviwabizanebovar.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/90633365568.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/rawolekozinozuvim.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/97634833920.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/kuzira.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/31511292382.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/da13db120dc4d03abf5564396d690a8a/mefixoz.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/zuxeb.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/6114347249.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b143b5c00---tomezodoxulakagezofo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b8e6734b---pubixijenilepiduzobugedix.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/26028b6bd407b7566ec2ad021f658db5/19554990082.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/90055647424.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9ca5225c---kelonitafisimux.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/wumeta.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9db8858ec8a57d5351f9dbf98815a6b2/94436740068.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/72583517703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=concierto+de+aranjuez+bolton+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_off0000b821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB821 10904 bytes
SHA-256: fd183f8ffe63dfd580fda33b34752ce86b396151fa2fb4c608f6a4449a5478f1
font_01_sfnt_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 18280 bytes
SHA-256: c3cacff67f1dd4b9107d70507535ed3a0a0b61fc20ed555e78856cbf73bedda0
font_02_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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