Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18e8ab1227c4913…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 07:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13e1dbdb77f9e54d23e5e0a9261aab13 SHA-1: 274b85db078f9a6444f51db5184d18d594e15471 SHA-256: b18e8ab1227c491310e119c46cfff5a0b175c811aeb633d42ffb8fa31a11809e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs indicates a potential phishing or SEO manipulation tactic. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=convergence+spasm+pdf PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f3b404c4---70545627559.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/87140356965.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a59dd7f1a71---31136368767.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/wezorupemekut.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/suusb5ndcuaop67bvc7d23ogt3/12408692905.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/kupazegoraxilavosatave.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/tidowuxewaz.pdfIn PDF document text
    • https://actor-conseil.com/files/file/68490157472.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1552143235---50690945016.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vexofurujoburipemarug.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/88764691392.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/wafelavoref.pdfIn PDF document text
    • http://www.celso.org/download/kebuxegowufabuxokijo.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/44082933801.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210814093609.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lalexadimejukuvusobugu.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/fokanigupifudadesitat.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/jogalosasogeli.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/piridatalosiviz.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/jivepewuladu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c53e07b524b---92116150598.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/03f3786f2e1f19b83673892d4ae6f01e/39984200329.pdfIn PDF document text
    • https://27061010.com/uploads/files/202108240358584109.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_off0000c814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 17480 bytes
SHA-256: 5f104bf43b55787e4cb24e808c384a108f5c21434410255b3cb2e04836451e5b
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 10824 bytes
SHA-256: e7023ac8f61bd7d725648ca79bcc8117cf316881c3098568e07c33f3aa13c4c1

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