Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb7fb85de027f90…

MALICIOUS

PDF

63.4 KB Created: 2021-06-24 22:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b2db3fd3a272da09f0fd472188f71b39 SHA-1: 3cc69820ec92b262464ab1a6b71bc2021feda34a SHA-256: fdb7fb85de027f903f6b042e2d19142a507a934ef0e9bc7156c24806ec92ff07
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/311b53dacd499e44c85eb5208913f127/17946638542.pdf In PDF document text
    • https://ceccarbotosani.ro/userfiles/file/26097782769.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e212e11b8---15702495679.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/64678454572.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/netavinivefikesevuw.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ing1bh15l48l2u7gb8su3fc1ug/fufexipekaturalipapaxezop.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210604120001655503.pdfIn PDF document text
    • http://wenxuezj.com/images/File/xositofumusirugeloso.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210617153318_38714g.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/82843774351.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/54979965159.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36d8681a1---72746548952.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0075f7d87ea926a7d910b67eb50821ca/voxipixixadojororajewajev.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/89158749048.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jejir.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/93081857885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=microsoft+data+warehouse+toolkit+pdfPDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAA 5404 bytes
SHA-256: efb2d3f8cd6fd368540feb95ef7b42c6fc6cc5b9d80c25e679ee35f3ece1c3c8
font_01_sfnt_off0000ce22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 10208 bytes
SHA-256: eb92e64a99b31903e21cff8eb26d8ac994ee67c925b85f62d02f91f5f9fb7d4e

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