Malicious PDF — malware analysis report

Static analysis result for SHA-256 3912f819d22fa558…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 22:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1cc301924caed600a7b5170cbc5448a SHA-1: 4ee8a2f49d741654c723c16b249adffd612825d0 SHA-256: 3912f819d22fa55844cc442c7efa7e56d1642356279d5a5381960e299e199181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lederstuhlshop.de/ckfinder/userfiles/files/goronusuxitujufozeteda.pdf In PDF document text
    • http://archinfo.ru/uploads/file/pejizunetovozena.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a5bdafe13622defadeeabd54a62f1e85/jupufajogebizopar.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/10120355986.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/novogigilitudelijilobuta.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/gimezorozisira.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/22649944542.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5fa5a89725d5d9fd125b0aa185004fe3/tozonove.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/53726265911.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6645f2c9e---kitiramowirapero.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/67e0868fe072b1383c1a2f5af6d6d96a/67795642832.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/tegeninalemivewawafuwe.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612018fcbfebe---1022939756.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/nizon.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/p3tb1u70lsollauhkep8hrsoc3/88145994394.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/sexopamewugapivusisedi.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/35487059655.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/padejetomejekivotitoxufi.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/24696105021.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/piralebibiz.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b38f2d2293b---27555595054.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d537964e12b0161e244138ac8be8af7d/wejoronimesidigitigizekuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tableau+de+bord+pdfPDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/vewusikuxegogim.pdfIn PDF document text
    • 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_off0000c279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC279 10232 bytes
SHA-256: ea0f0f68b2fcd167d86a37d579993e2a6d6e9c7aab24c1b92ccbfba728b7ea21
font_01_sfnt_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 18824 bytes
SHA-256: 4738450a4d0649ed9d37de98ab91458b24891038721b8c860980a43cd177f649

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