Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd49af91e836703…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 20:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ba5f0d256ac9fa1d1498476e5ef27f3 SHA-1: d8a78b49eb0e9e93c59d5da5b29ad1944831ace7 SHA-256: edd49af91e836703b8183630d88a3aa81b7f42a3b4d18dd27f6e099d6e058012
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document that exhibits characteristics of a remote support lure, instructing the user to install or connect with remote support tools. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into granting remote access, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://proartgaleria.hu/files/files/lunikij.pdf In PDF document text
    • https://bloomlight.pl/_bloom/file/jupenonukadada.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/137203887e7b0d26263b2ff2f1207733/tewagati.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/kakolaburutizufewe.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/lamil.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/29399295381.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/58844443374.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/63265877086.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613356fc9b51e---83258747130.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/namasomux.pdfIn PDF document text
    • http://fabtur.ru/upload/files/62725705849.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b7c41ac9abe7967ba6ef9b312a4cd4cd/49419791455.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/62339381805.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/76127313047.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/56279869027.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/5146812052.pdfIn PDF document text
    • http://leguido.net/files/fopuresipajopokubod.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/polozojomafalekinuf.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/nijed.pdfIn PDF document text
    • http://gdgom.com/upload/file/210919100055808693208akrj9uu4s.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/78416561872.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/32071392600.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/85640575574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=remote+desktop+connection+android+appPDF 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_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 17428 bytes
SHA-256: 11d1ff915f70ff82a7dd5cda08442f8c786a4b8e94af5354aaabecd8055314fe
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 10768 bytes
SHA-256: f7bd93c7c24275a8dd7a7c697e76f3dc3f2e4e4e1e5fa7242fbf6b4ad17e2af3

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