Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e68ccb162492107…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 12:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1fb454f532fba92e7b17c9e4a671157 SHA-1: e87c0905a6623ee8998e44742c812139d3fa19bb SHA-256: 3e68ccb162492107538eebe01d9e2e2ed8777a5bc7a0eeb5310acac9fdc1ccb5
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://masihpt1.com/contents/files/guxufonigefaxinu.pdf In PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/mukovi.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/20656585577.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/dolexuxogerimefaxo.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/36131960394.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kogukurifilovedaperazala.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/i5tgs718so1tp7ebiici1k65rs/88454043082.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/vupula.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d236b566b5---zonojolunile.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/firovubesikawivikaxel.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/mizoj.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/73475291008.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/9535374284.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/tinalo.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/43201295952.pdfIn PDF document text
    • http://matras-devison.com/upload/file/fifesedevimuviwuzedipido.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/tutifez.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/nixiro.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/temimumodulid.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210901112333.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ccad947b---wutowinaworakaxeriv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+instagram+story+saver+app+for+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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 11028 bytes
SHA-256: f002822555d41697642eba02aa29ef42e566664a8bcb027b6c9081a7c0aec9ba
font_02_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 17140 bytes
SHA-256: dc92ba723cfdf7d0ba059ff8258f3fb98f13e9c8c079b5c0e6ec15db32ab866c