Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4453a2e7181e67…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 10:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8727506c28b640575c8625d292c5788d SHA-1: 784d7c66a26c95c08b35d7a64c58d2896b988f61 SHA-256: 0e4453a2e7181e67b7b80203c281f54a6e1d89d463e92b48e1ac873af3de2274
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery mechanism. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=qualitative+methods+journal+pdf PDF link annotation
    • https://lesrimaudieres.com/images/uploads/file/motonabepejuvozivigago.pdfIn PDF document text
    • http://tao123.me/pro_pic/files/33811635567.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jolibugutitavini.pdfIn PDF document text
    • http://k1a.ru/images/files/file/tivuwezujed.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/df3f05c847034b2c6d12c1ee1de1ff58/61457282406.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/67866950203.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/255cbf68a9b123acd9d85f38ea8cfc2f/xumavazovafaribani.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/07b236b70079bf9a59abc5954b065e31/fupixakasemulutuxisimagez.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/e56d24eda9f29648f873fda446402753/lapugezariximibovu.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/zewazenerole.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606da252acb5b---18215578481.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5ce9bb33f60ba2a9b403543a2640bbaa/zujoxadulepexitimir.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1cd9739ac---kuzegezovijamojuvulavaw.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/xagarejus.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/64320476165.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/fesifezugutidimezebegisul.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ihcgb2bnbf5c90cg0278d8lir9/giluwenixuvakemufuzijarim.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b27c20ef14a90ffaaa0ab0d03f558f27/tikovadumirijugod.pdfIn PDF document text
    • https://petala.gr/userfiles/file/bosutozelifejasowevanor.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bt3o7ij25u9gol2n26nqtpcpds/niwosatu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f33494c2bc5333ad76d19413f5044eb2/20820196751.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b7de9829---94856898612.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_off0000b57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 11120 bytes
SHA-256: 7f8683dedbe6e3cddf210338a922a5af665da89c2a973932e40170e94fc5721f
font_02_sfnt_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 17036 bytes
SHA-256: 507fdddaaddce210ca745a2d54aa93b97aaaaf5cbd4fe31834ec18916c26c14d

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