Malicious PDF — malware analysis report

Static analysis result for SHA-256 09476a4491ae5cf4…

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 16:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ad6d6c252d6ad0b6e3254779e56ce7a SHA-1: b79952ea7d0f4b93163b4b1546a0765f3ad51759 SHA-256: 09476a4491ae5cf463229d1ad3734a8caee43eb02c8031d3c9600ff7cf97e389
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate that the document is likely intended to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=combined+oral+contraceptive+pills+for+treatment+of+acne+pdf PDF link annotation
    • https://marblo.com/app/webroot/img/files/61259879886.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/87375636532.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/54802257627.pdfIn PDF document text
    • http://momsystem.ru/public/file/jusobidugasolaru.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/44147269620.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a70283535a7---65736494348.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/zozub.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/05879e4ecabfd518ee27d918f75521d0/wodoxalol.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/66674333577.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u7g000lt15a838ta6efreq55hv/xusow.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/21083971380.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/zaxix.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/812960584.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/7631387677.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/domarutirofetusoxi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada83f82f38---bopukexipopinefuvoledon.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/xirutedalitijexapepe.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/paluxurufosudemig.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1be83d159---zukudorariri.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/52492058588.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7a1c52668c5a26eef6e8ef2fab648311/tadinevaxuv.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/dimawo.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/96187489295.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_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 11016 bytes
SHA-256: 359707dc755ff0994e69d0489cfde1e94444742d585972c25df3097618ddc89b
font_02_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 18372 bytes
SHA-256: 1ae0778f8348af1b3a040e258f9712d5ffd615430c0a6b70673955269f8394b3

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