Malicious PDF — malware analysis report

Static analysis result for SHA-256 220e3830e5b6baf1…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 06:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bad84011a2677cf2df6a7c99eadba7c0 SHA-1: 585fdf715fccd63cd3547a45bc867849e075b924 SHA-256: 220e3830e5b6baf10602126984e4defbe77e8241704eedc7bde09663981ce529
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further exploitation or download of additional payloads.

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://3qbuy.com/CKEdit/upload/files/92732349250.pdf In PDF document text
    • http://1careglobal.com/upload/files/35574796063.pdfIn PDF document text
    • https://regenerateacademy.com/file/81886585202.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dovowitetimugesuwetis.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed7b42c05---8490305179.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/fopakigo.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/32714798696.pdfIn PDF document text
    • http://mutitar.com/user_img/files/76029012640.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/deguxum.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/71b07889a56e6ae2aab0e088c4f0811b/gedovomobudazodezeseta.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf7241ff4---4243948560.pdfIn PDF document text
    • http://remobudostol.pl/pliki/jogogujonevebevorixus.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/fodokuxego.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3cb30a64a---82241288298.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/18698833068.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/64831356993.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/sidewilezekimopureb.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/wimobanukobunaru.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/32595215609.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/55741195909.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/kegetaveferiditesomiwaboj.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/dodatu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b85673bfc2---dopavapivopowu.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/migomuterunanupazak.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/29045208108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+minecraft+bedrock+edition+apkPDF 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_off0000c2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E3 16280 bytes
SHA-256: ee61e34123a215d4ff1ab8544ab42fd8ab8133d720dfa57c8c5c569fa7468a1e
font_01_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 10932 bytes
SHA-256: 15014e31d250dae81a963a77341f82b20fd074faf0fcb5b50968f9f92b8845e9
font_02_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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