Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dafea747b6f005…

MALICIOUS

PDF

69.6 KB Created: 2021-09-06 06:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b53dd3d4b4ce94b34a681ccdb7748bab SHA-1: 53dee7d1d463bd825f7445c9948a88f75faea4c0 SHA-256: 52dafea747b6f0058364e8285dd4e2effbc43d0d7a2a3582a02c679d1b60bc31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage existing vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kiszelyugyvediiroda.hu/docs/file/fasupitafa.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f59375547207e1466653916dbc9933b9/54022458438.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/5047743425.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ae701ae06---35772449973.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/rukaxe.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/53988211386.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/44566461201.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a441cdc062b---tebawowovidafu.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/wegijisutobegizaf.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/fetageraxoxesakupimagoka.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/193ba4bffff4c707facdde0efc6ac8ec/mopibifusekesamira.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972b5ce42b3---gewodu.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/kipaxodiparetutupajud.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/bojuxodirakujorut.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607576f2bd363---66771333544.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/61417215026.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d98c90f266470f09810aeaa0cea33d5d/63329842901.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/10315859226.pdfIn PDF document text
    • http://roocenter.ru/upload/file/sazok.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/91738524598.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f2f65a92b174c7af4e4483e0352127f6/64684414951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=54321+grounding+technique+worksheetPDF 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://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_off0000b1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 11324 bytes
SHA-256: 04b62ca21ee0b565a274e1de80ef29fc9e3bf80c84b0c21eb675c310cc48e488
font_02_sfnt_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 14852 bytes
SHA-256: 6d3e153314e0b2fb7acde72b6d2a628effe17816cd3bd9f9e0cba1b6a491a7b9

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