Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c946c4ff1ba0c14…

MALICIOUS

PDF

84.9 KB Created: 2021-06-24 22:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2c70eae44634d79e37d4b4d8beec3909 SHA-1: d9ee654336b35375176674e2580089d70da23fad SHA-256: 3c946c4ff1ba0c14cc1500cda3801ff7fbfe5893183241a24814f7c54163e1a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f18b5a51a---zetolenunudodafezet.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0d6e3f89---gudogonovo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/501dae91d81bf7358577d9b9ed61412f/63673604680.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hkj8v0n2u3d6c9ct75f9m3d321/fedamepivaxilu.pdfIn PDF document text
    • http://grimastone.ru/files/65782357092.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/senojopakigewewiku.pdfIn PDF document text
    • https://edusfera.pl/upload/file/2529025310.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/p6d08gf01hsdufmbo75241vqnr/tenopajoso.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/23lr49vb5aj1phkc74ecrouft8/rotarotajoxotulul.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/sv1fpovdd4hbt69m9ch5lb5e4v/xoxobakabamuvovelalu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pomanubufadowupesowak.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609082fd7c4cc---47348289003.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zajafotimasu.pdfIn PDF document text
    • https://sambelteri.com/contents//files/bixofizofonitojazug.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ih1g0ua4skpphoamkv2bn3fuom/xigipezodisifudov.pdfIn PDF document text
    • http://vizcsap.hu/files/file/13234010726.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=manual+assembly+techniques+engineeringPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 5356 bytes
SHA-256: 7a6908a66b21cb4d7d87865e36071008b36c466c2bacb0d5a9e2ee5f7ea06fa9
font_01_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 11552 bytes
SHA-256: a7639e9d28de41bc7b4166480e24e7cff54523b3ef31fa8f9fd8ee4ed0e27efd
font_02_sfnt_off00013895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333