Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57d6ac52438c04a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 13:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e382545a90df9ea8efcbe4282a26cb93 SHA-1: 8e596ccb05aeb3f72ecc49f9dd8cebf8848f4cd4 SHA-256: a57d6ac52438c04afd59e797f815868be6ca3b3c254b1cc977152d17ec6390ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=nba2k20+v97+apk PDF link annotation
    • http://euroear.eu/ckfinder/userfiles/files/27138776260.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/kegiwebujipiliwigirefobex.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/abc66542af07f1159f0112a2501189eb/forojaseloze.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/65432680107.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0fa2b532---kituvom.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/bamukoluxijeweko.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2eed2ead---gogapejatadur.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/76447974106.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/15677476294.pdfIn PDF document text
    • https://petek.biz/resimler/files/vuxirumadu.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/37762026627.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/26160552587.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/bukirikajejulupevege.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c513e795c3098d6e87898d8a0b207863/toxuvisovujavovitusini.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/junuwarakef.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/rutegim.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/28940317058.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8102d46d---19000895630.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/sitawosaza.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/92089220050.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/zunaxixanu.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/72169049490.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/jeveronusolujujo.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/41443745923.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/jevopuvolu.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/90742754088.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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 10120 bytes
SHA-256: 6367f7bbe30dd5e2ff6c24e0b4a21a8a867f14a4a21a407e9da92a416881fb63
font_01_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 19468 bytes
SHA-256: daacd5d770ecb88409a9d8ba8d8e97c1c210e70f00f3a9de3240323573c68891
font_02_sfnt_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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