Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee25c31556d1601…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 21:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45e5440000ef0b3ee6fa44f281cbe026 SHA-1: a5d9c3ccdae1bf05d93e445586e440582ff688cf SHA-256: 4ee25c31556d1601ca5f32c71e01ac282b3ada87821e6eff858c94f62872e0a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of links with 'utm_term=download+gta+5+mobile+obb' indicates a lure to trick users into downloading fake software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=download+gta+5+mobile+obb PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/dd1c039ef144c00fd3ebe92e230a5188/bumevexitufuj.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d6f6405d---lunonisiruweru.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/58a26c63d2367ede45220a05d2ac70c1/56062194354.pdfIn PDF document text
    • http://castel.lu/userfiles/files/20800577700.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210909035604_ODQzNjEyOTY4NDU=.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/nodowivogoz.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/91229637554.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/xirebalikarogalixu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133a94b58702---fojuzixurulemegun.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109140015181051.pdfIn PDF document text
    • https://promise-land.com/upload/file/zetixesubivatebezigot.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/vemirel.pdfIn PDF document text
    • http://sgpeo.pl/users/file/vemerasuguzolo.pdfIn PDF document text
    • http://zamgph.com/uploads/file/14190135480.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/pojuxisutotowuvix.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vedadugabexedo.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/83455924842.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/10318819559.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/fumenezo.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/81368380859.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/tikupigemuwi.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/77022623205.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/24372409184.pdfIn PDF document text
    • http://119pump.net/d/files/nasob.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_off0000c481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 10684 bytes
SHA-256: 91a9cd819f5da342e73672dfb49ddf7e73412db5598fcc279d6762d05aa581b8
font_02_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 16864 bytes
SHA-256: e8370a2fbb7687ed2928d5862178a2ba9c707c21f47b112ab67d97c308a0525d