Malicious PDF — malware analysis report

Static analysis result for SHA-256 989e40f2ad614b29…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 18:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dab431e717d821cbd7389ccbde78b1d3 SHA-1: 617aa0669c899e8eca6d66bc097a2de6b7f5b4cd SHA-256: 989e40f2ad614b29da2176f51175e3886dcc0f37e58bb0e196eb805fe9a30b60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains an embedded JavaScript stream and numerous external URIs, many of which point to PDF files hosted on compromised WordPress sites and other disposable domains, indicating a link farm designed for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/54334912572.pdf In PDF document text
    • http://jnnycc.org/userfiles/file/91241748391.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/86632265246.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210901182118.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/zulodomudosuxagowawanud.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/24573784397.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/moreta.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kasowewumabusasapuwuwejo.pdfIn PDF document text
    • http://novichiha.ru/pic/file/bifido.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/lulewawasomik.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/56275715991.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614197da62ec5---sajifusaxilul.pdfIn PDF document text
    • http://hla.vn/upload/files/pogonoripabosotuw.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/sitatub.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/felaxunixelamudufa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc85d35f8---6910302344.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a936664fed---75586121401.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/waxiv.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/wugozekukej.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/gunuj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cc049a85---fisaxe.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/34392875448.pdfIn PDF document text
    • http://carbontuning.ru/file/29241413441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dokkan+android+13PDF 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_off0000b8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 10116 bytes
SHA-256: 90781819d5619bfa79eaa72c5fa71282491f9e4085fb3fe6bc4be350c12ebb96
font_02_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 16488 bytes
SHA-256: edc12c4f8795f315109913736449b0c8c22b23abfd2a610929b2794915be7a2b

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