Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38e448c243f4d04…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 00:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af79d5e956b255d3867048843b39ec57 SHA-1: ed0548457c4f160cc0bff76ca601b6f40dbc3687 SHA-256: f38e448c243f4d044736f4f628e2d57fe78d9429a85631262ca6df9d3ca01fd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of external URIs and link farm characteristics suggests an intent to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=aladdin+1992+full+movie+download PDF link annotation
    • http://microsolder.hu/userfiles/files/36792228725.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fozekofilezukeragigedi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kblh8amad0hu3qvi323jb88og6/tirubopebugekoxake.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423626ced5d---88095910355.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/12000085780.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109091007462505.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0c8f3bdfbca763e1a684b894edaa0b7a/50460919007.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/fofewak.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/73531330941.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/5238603472.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/2377795214.pdfIn PDF document text
    • http://wmsone.com/eimages/file/pavopoweva.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/25641026789.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/96656338706.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/40854192119.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109101417413559.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/xekirisevoxoderefagewan.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/23732065357.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/47786305527.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210915191751.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/gomofenafedevebe.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/bepiroronawijapemipe.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/67425287237.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/36847902688.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_off0000b1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DF 14884 bytes
SHA-256: 7cedbf54a3834ec91f250816e58101ffa6847bf6923e1c1d89ab96dec6c80f6e
font_01_sfnt_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 10724 bytes
SHA-256: 1c4fec8fe5093aab23bcb42abf125207dad68f5b4b6eefe95729aee46ef87b3f
font_02_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1