Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aae0fecbec44efd…

MALICIOUS

PDF

100.6 KB Created: 2021-08-29 21:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b117491ba00dfc1287a1d909848abc7e SHA-1: b914adb66da2a72d40b9942289a057cb54c06ba3 SHA-256: 4aae0fecbec44efda6aad487b666b22fe2bc0738cac90dcb32ec6e5a8918ed40
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous potentially compromised websites, likely intended to trick the user into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests this intent. While no scripts were directly extracted, the nature of the links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ghalemdi.com/userfiles/file/12499751652.pdf In PDF document text
    • https://aquatrustfina.com/userfiles/file/65073929788.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/91199859765.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/xivegarokodeg.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/3202582979.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bo3ohdn1ta2dmvl4mendgebhn5/4248650647.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/9351683737.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/79797901841.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0b110e4721f25e7bb874b9d365629791/kulupil.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/81780bc8d702e4af9493aaceb1b43c2e/67484737726.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd5223430---rotosimiwasiguduf.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/87062280957.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608888d466908---kezifatolutefitobeviga.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c854b0b38---13477168329.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8d3d21873ef8c11be0cf48d8fd6e48f3/kewemaled.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a5208977e---31623467364.pdfIn PDF document text
    • https://medpressa.ru/files/file/68199142504.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wulidasizofuxok.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/38161401795.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/tumapabaxasobenuxo.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de28339c2f---35114915362.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/nudis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ppsspp+iso+filePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 9888 bytes
SHA-256: 38fd0a9a25ddbf1f4038f9bac51aaa8b6f07f672e831daf55da86bcc17c2e838
font_02_sfnt_off000146a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A8 19032 bytes
SHA-256: 8b81c64d51a05aed92f19dcfef287c1dac60cf4617dd0f46b2a4015288f5cdd4
font_03_sfnt_off0001780a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1780A 2832 bytes
SHA-256: e0941c6221a795574581fbfdc57cd206b5767e859f62cb83ddbcd06be30754d9