Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed915ba3a0385b36…

MALICIOUS

PDF

71.0 KB Created: 2021-09-22 18:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d118ebcc7da2bb0d60adc2cf8c9f1bd SHA-1: 51783d51aae786086c6d5403a6786f9e08386e69 SHA-256: ed915ba3a0385b3614f9d92c7712389ed99a8857d4874e31c4909b41f1066c03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content, likely for phishing or malware delivery. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=wallpaper+hd+download+for+android+mobile+2020+nature+wallpaper PDF link annotation
    • https://strechybenesov.cz/content/95537216306.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/84104367280.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/70898196060.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/pemawerawataw.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vupotemaf.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/31649458063.pdfIn PDF document text
    • http://asid.rw/userfiles/file/futerumedunazuboxuroli.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/86999289770.pdfIn PDF document text
    • http://1careglobal.com/upload/files/safutogusedus.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/50182418720.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd697dd99---4156311101.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce20e9251a---rifotobevum.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/karumofatofisegubiganulet.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2a521ed4125be325464e359ded3de379/menilafaku.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db369cae4---20335721863.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/36921049640.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109200107285569.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/8489454633.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/jeresosiseno.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/11245920052.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/lekizipanakilonajipu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c8d6c554---negekudima.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_off0000b5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F3 11156 bytes
SHA-256: eaab29c5c6817f7b459eeb50c7cef564e4eaa02ab12eec420f66a6c02adce117
font_01_sfnt_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 15320 bytes
SHA-256: 9678333cc961d2318405c2bf474cb5f044764909e977aaab1480c97a468a0155
font_02_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1