Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf21ed44e4b4e64d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 18:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8bee443c4ce2ba0f01d96cdfe27d68f3 SHA-1: f2af86a94bbde690876a69a02a3fb6385fe3d7bc SHA-256: bf21ed44e4b4e64d8a0c6f17c26c0f2d809fb918ce8390f254097d7c75e6384e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous embedded URLs, including one identified as a link farm on disposable hosting, suggests an attempt to redirect the user to a malicious site. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://honderhotel.com/UploadFiles/FCKeditor/20210903043118.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f446807a---xosinipifadegebasewafibu.pdfIn PDF document text
    • https://langumeistras.lt/i/File/50761444040.pdfIn PDF document text
    • http://leguido.net/files/pufonitezokoj.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/48817108371.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/vefagenudezumezitov.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146d36648ed6---65867268625.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/bumabuxax.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/sakimudukuv.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/57674277054.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wibewirenanetotala.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/69583449902.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/pasovusasorigi.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/rifimeduzixigabipiw.pdfIn PDF document text
    • https://renteci.com/imagens/file/39895507058.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/4163128723.pdfIn PDF document text
    • https://aksusu.com/upload/files/fudirilelagigavilip.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/pakemujikogen.pdfIn PDF document text
    • https://begili.com/uploads/image/files/zimavepa.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/64508457502.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/75838752742.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/demepifebefoditalikamuf.pdfIn PDF document text
    • http://land89.com/ckupload/files/vopijukafele.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/87552014289.pdfIn PDF document text
    • https://tebra.si/userfiles/file/sonosasi.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/fobison.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=happy+campers+5+student+book+pdfPDF 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_off0000d3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 17640 bytes
SHA-256: 4e85a7875b575feb4f746dfec843e73bc84543656220da0718e6ebd8269af27a
font_02_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 11216 bytes
SHA-256: c1160ca6d1ab0b16945e339dccc344d1df87413537ee01c9b8ebe74d1447588c