Malicious PDF — malware analysis report

Static analysis result for SHA-256 772e9b0b48a8e5f2…

MALICIOUS

PDF

84.6 KB Created: 2021-07-16 21:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f0efb9106a3a5a0db10fe7b87f5d55a SHA-1: aaad41942d84f5996eac3e3bce164ce0105e513a SHA-256: 772e9b0b48a8e5f2ce753e67a496aa8c03dca9ff774b73cee0a1e84ff9e41743
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of malicious activity designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mhs69indians.com/clients/864804/File/rotogesujuniwiki.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d820157b343---nukotibexesetav.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/21459726732.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8317912077.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/lusuzegevezodaren.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/57670488420.pdfIn PDF document text
    • http://petrduchek.com/files/kemutesixarukikado.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/rexopox.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/xonanoj.pdfIn PDF document text
    • https://ijpdua.com/contents//files/zifizejisikebuvowex.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/6147859980.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/zelijudefe.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093fcad84707---91410421472.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b214996e938---nasazubiteze.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a059bd85fe4---32940596381.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3504bfaf1---lulumubil.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/vogudeka.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/25285165653.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ab8f572954e3f45b3b255b367e32f50b/tatubusenizegorarud.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/wuvogademosagezaratev.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/11601973760.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fbfd7e541---kisarewilaretadejolape.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609e838e64a73---64280101338.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/dizulejuwuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+shelve+fiction+books+in+a+libraryPDF 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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 10924 bytes
SHA-256: 68fa9cc991ec5674f1b06f050877164c341ddc2a70b5f2c622481b29f1db4aec
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 16044 bytes
SHA-256: 6ed419cd69d4c4a9f9cbd12c28e18974a9d664088774038018a78c820d3c685e
font_02_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1