Malicious PDF — malware analysis report

Static analysis result for SHA-256 9678c3ba0174e366…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 19:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e15655e32c82fa368abc11de871862a SHA-1: 6b2552282a7fbea52366d9221a64214bb07631b0 SHA-256: 9678c3ba0174e366a5ae34c160cf8f1f84bb9067ea2b456a7f7639ce38173b2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/85127b4db2cddefd930ba318bf626186/mepezuneduxupelizusamezun.pdf In PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/bulawuxafisigipo.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/monaboka.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/gevulimivupufirunelikigud.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb2cb1bec---6603887726.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/xoboxunamexitogilewe.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/visuso.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/delakajadexizafokiru.pdfIn PDF document text
    • https://polytex.de/sites/default/files/tesilogal.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/52338763667.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707409c2622---47057027082.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8f2bb4285f1c1481cd83f522c1edc306/91311608910.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/73964163956.pdfIn PDF document text
    • https://gilbertems.com/videos/file/xekup.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe395d8dad---86121442467.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/79817356254.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/fatubogutu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a936096ccd---ribotawiru.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/zaxaj.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/xeduxiwatawozaxutifalalej.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/68302236875.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/roforazadedigu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/cki5659dv86d47mvq56qarce11/mepiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a+song+of+ice+and+fire+audiobook+downloadPDF link annotation
    • 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_off0000c40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40D 17092 bytes
SHA-256: 4e265bdb342bbb3337c6ec929d549f9716b4f821f60ef7b7f9c82e77aff38230
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 10952 bytes
SHA-256: 5c28d28467de06b76e384d352c3ff32357cee01b3e0352310332fb27b5f79669
font_02_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1