Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7a96bf0167e5a3…

MALICIOUS

PDF

70.0 KB Created: 2021-09-11 00:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6dbfb4da4b17f623f69db0ff2a09cff8 SHA-1: 8403203141dba92366110528d5345a53d7946c32 SHA-256: 3e7a96bf0167e5a3d2420fc77f4925383c17c1f8329b9b422575f710e73c89a2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hebatkeren88.com/contents/files/torawozodeluxisobilugug.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/nqkekc0f3gm499g6bikl8bthru/gogatesupabagexadi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/58768166779.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613021da9b7af---70556382088.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/vizok.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304f7669e3.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/dawabepalamesulegipu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/wuzimemuwumi.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/80424338177.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/mirogugufed.pdfIn PDF document text
    • http://hla.vn/upload/files/govulu.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/6752786744.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109051127376619.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/81822859457.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/25520553374.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/36277055592.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/64609417050.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/90982835684.pdfIn PDF document text
    • http://kco.su/userfiles/file/3096898538.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/wamif.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/vadafavirotovurotabixal.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/xixugivekipozi.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/72d19af06b1f9c53cff68b31c3365d28/vosixokilodugekujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=clean+master+app+lockPDF 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_off0000b4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B7 10564 bytes
SHA-256: 15191be76e9728b153e43c82e0c273402bf8c666b464ad71259326852c8bc1ad
font_01_sfnt_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 14996 bytes
SHA-256: 67aa80d63981c10153954c7360c9de7953d4d94ac4c05324c12197b89c908ff0