Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c21f9cb9df4510…

MALICIOUS

PDF

80.4 KB Created: 2021-05-30 08:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 19df145b309089e7f605df7958503250 SHA-1: a0390fad5739d1cb11a6944b7cda71cb570bd8f6 SHA-256: 46c21f9cb9df4510ae4a5680f4f4119ee25f857fc0804014024195cab3cdcd53
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be related to translation services, a common pretext for phishing attacks.

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 https://medvor.ru/uplcv?utm_term=traduction+pdf+anglais+fran%25C3%25A7ais+ais+en+ligne+gratuit+google PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078cdea0a6a7---xetitiw.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ll15kce7keiminoloog9joa91g/5326146720.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc05ed3aa5---13182466235.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9dcbbh66v6q8ka2lt5cqss55h2/bivikofi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/c7219cv04q67i4s80b5gjoqbe6/rosiseniwi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160824e36344da---48530714014.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2a5d1f487---puwoxeji.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6674d3bdf---jutapixulonubivagizej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2d88936f---mubaf.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b4726921810927950f188e097c748896/xeliwixepokirumo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wamixe.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ca683a4559633eeefebf2f43c1e8b84b/jaxogivevomerol.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1de1d185---81078842977.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/dofajobu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d95b8cabc158af8dfc87269ddc7e535e/japekekan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 5456 bytes
SHA-256: d984208eadc9d1feeb595bf1cbbeebcc2f037345ddb04602266c1f15f4734183
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 13728 bytes
SHA-256: 707d457f69cbb06147ef4d2484547717ab048c211d3c3f91d04b129072d694b6