Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50dd824a07c733f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 17:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 166773cf50f6d0bc47cf0bc6dd92a567 SHA-1: 85af5c86470404d45918b8aac3835ecf4388e27f SHA-256: e50dd824a07c733f7fc2fc100ffa5d274cd7b52eb1b099aa051b5bad802f68fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to redirect users to malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=sbi+po+syllabus+2018+pdf+free+download PDF link annotation
    • http://trekkingsapatours.com/upload/files/98767601453.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/63506fa9bb261f1221d67d07a61a68d6/73340140890.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/9889045444.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/fokoram.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/3293654111.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5082765166c316fed7e92069f79423d4/34414328347.pdfIn PDF document text
    • https://tavio.ru/files/file/lonuwa.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zewifameb.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/lujupiserumozuvelelode.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jarixixedukiwuke.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/litikirewanasi.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/95830643437.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/gabofavowatijasibegezulun.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bda1ca31816---53888602423.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609a10e97e7eb---nisaxaxejud.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dcaecd06dfd3185156089cde60f7ef65/61714942228.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/54635462339.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/88566634091.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/26245391277.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/vabibuma.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16123bcce4db2f---xogagomurefetonadazalo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0aaab570---15450826237.pdfIn PDF document text
    • http://berbun.com/user_img/file/natawewasulukegore.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/megajugiwemifisobezudetep.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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 17916 bytes
SHA-256: 3e08389c89bef3a56ab33ee8faee6089bac0d7958f9510e8fd641c3c8a8b0a48
font_01_sfnt_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBF 11412 bytes
SHA-256: 09124b48c8959ea87dbcee141a45ed6d56a0c7ddb64b5145d3aaeb4393777346

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