Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef4623ce56cd4a9…

MALICIOUS

PDF

83.0 KB Created: 2021-08-26 08:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f3e0a3c4b92c0bc425ccae1dd2e9073 SHA-1: bcb7eaf4cd21436f039b60177d123552f4c7c1b9 SHA-256: 4ef4623ce56cd4a9c86b7703189a0c16784a08fb16dadf996896cbae9e1c116f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or link-farming campaign. The presence of these links and the detection scores strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crysiq.ru/uplcv?utm_term=equation+of+line+passing+through+three+points PDF link annotation
    • http://geoman.cz/data/file/17517811869.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/82220535391.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a95f26e9---vegiwulegepop.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/71597018357.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/misinomojukokugag.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a460e624e74---67159033191.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/tojumonojif.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/divakipobavalaxolimufo.pdfIn PDF document text
    • http://plncse.hu/php_data/file/pivejilitalowu.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/69928152453.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/q1hap1engps1ej6eereo3q9d90/nepinolet.pdfIn PDF document text
    • http://goref.ru/files/file/83776297932.pdfIn PDF document text
    • https://banghenails.com/upload/file/kagekesavebaz.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/90517077774.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/68593970303.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/92797793879.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/zijota.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/34634781393.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/73826581507.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/wofikonoli.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ab96626b6---jufokasepuwegisol.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/85487ebb7faeb425edde4bafa2112b8a/vuvuzato.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fe4c629e4---boluxorivuri.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/pexixorubufuxuj.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_off0000de76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 17484 bytes
SHA-256: 7d56aaf0dbdc26ff531f152ecdaeac25d3d73cbaa4d6b20dc605829ec69dd75f
font_01_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 10868 bytes
SHA-256: 42927c7d12be9ce1055d7c4607bea0997b53e2e21bfe2bd58bdcdd9d78d381d6
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.