Malicious PDF — malware analysis report

Static analysis result for SHA-256 690f96d262951ab5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 06:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33e9c437099084489d06d3a27eb0d014 SHA-1: c6e2a1300efed51c9c37405e3cccb71bb11111cf SHA-256: 690f96d262951ab553aba3f39d7d85a3d496c2f2d8a5e0560f492a31ff0ea0c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded content are consistent with attempts to exploit vulnerabilities or deliver further payloads, likely via JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=20+prinsip+ikhwanul+muslimin+pdf PDF link annotation
    • http://cec-intl.ru/app/webroot/files/file/gadiramobuxe.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f30e9f61925d9ae8486e4317a020b3e6/raserarozeramukerewowemes.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/3545378505.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1baf8d712---85212391593.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9lic9o261j8k2as4i2delcllu2/32244060882.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/851bdfb11f844d6f882693b7ba9b5d8d/7864272088.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ea8a4a82a---gosajipimamatagutu.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/kobesuramefavagoku.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/062323443764.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0240be77---84788001331.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/15367654102.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d0dc79d4---serofuxavo.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/57432128016.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2a69411f1bab53b35fde3f33c8444db6/20095674589.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/7784905757.pdfIn PDF document text
    • http://keacg.com/upload/files/76038480311.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/47371520018.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nivuf.pdfIn PDF document text
    • http://hadt.vn/upload/files/39258624276.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ad6b55bfcb2c80f507d53aa6df95e61/57774091417.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f475f8465f5b412276cd07355a7d26d4/jewexasiba.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5978980ef7---jiwusuzibosimevesanepuv.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nu87iso93kh2nihj52hd7j5h64/toderututubokaburudova.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_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 10836 bytes
SHA-256: 4df79a02c56c633580ff7454d2ba54f8c143e946d3e8b500f7b6178123aacd98
font_02_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 19604 bytes
SHA-256: bdbda2cf199b100cca80a76da7dc3522e26815a43499a1548b37bf45eb1318e5

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