Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a655246e78a3f55…

MALICIOUS

PDF

88.6 KB Created: 2021-10-04 12:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 096696bb599c4cc8acbd99798369094d SHA-1: f79359310eaab382f40cb5b6b2877a0a51455eae SHA-256: 6a655246e78a3f55efa8d767dfbbbe4eea479c0118b692cc44fbd376c140da94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites and domains often used for hosting malicious content. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming its malicious nature. The primary attack pattern involves luring users to external sites via these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=how+to+traumatize+your+child+pdf PDF link annotation
    • https://tigaintan.com/contents/files/pexina.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16158884fbfdf1---12738096171.pdfIn PDF document text
    • http://sanjarbek.uz/userfiles/file/20180344194.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/govowidib.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/gewipawositidunebuxidubal.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/fibovelikomuxozojakoruf.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/76167843627.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/12359747737.pdfIn PDF document text
    • https://miminku5.com/contents/files/fexib.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b72f44965---rokewuzezadodakuberajidu.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/59108922132.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/degepozasipalerurekopune.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/foboxupakofubuwuzumanipum.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/23849388973.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/winisipunidolivofa.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/lejemolen.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/mezofuvog.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417b4c94803---sebuw.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f903ebcdbd---kedarub.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16149a0a371a35---43858554922.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/25520434796.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/pukakiwekaweb.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_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 18684 bytes
SHA-256: 28d7016b627c24e5aeba60fe72619690102c5b099219c86a41eb70d08fb533d0
font_01_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B94 10964 bytes
SHA-256: 5046bb9d9748430e007e8cad77c177184589cdfb5f4920fa1433758f1a5866c2