Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee14dfbfa88f5e3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 07:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 704256847b3ee7bff060f3c854abe456 SHA-1: dff31ba4ef1c2e84bdd5fd912834eb9f0812aee2 SHA-256: 3ee14dfbfa88f5e3f3edebc57f0b53ab8e39c66589e96cee6c9e20554f1ad375
156 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs hosted on various domains, many of which are flagged as unknown or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links suggests an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://goref.ru/files/file/zowobudomazizumozunifovem.pdf In PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908144935.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5ddc324bfa7e43742949fc0167a73060/loxuxasitixeji.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319bdb7e52f---ximibosigagujosipapabowol.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/jojelafamo.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/24960023796.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/rowodeten.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/64323261016.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/58450245597.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/1290479519.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/89481844659.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/70337982073.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132653e4ddcb---xazebezatazikufom.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/36178414161.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/73057287449.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/52660140330.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/dogapejukubalomemop.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910170347.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/lukadejupazuluverumexukuf.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090112033057762.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/matejig.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/28823922751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=128gb+vs+256gb+surface+proPDF 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_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 11204 bytes
SHA-256: b3238bf56d26ce47f572d2daed50f9dc2818bedfe8287d7cb612d40e528ea70a
font_01_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 17860 bytes
SHA-256: 608f1779617d840ef5f031b5dbb374b1a3128546abae71346f51fcbcabf05d26
font_02_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1