Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ba3682ae88e50a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 02:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60ce8fc6aef204f8275efdd608745319 SHA-1: 9d2a5f166bd0e3f3b217e0c80e81237b7a224e3d SHA-256: 96ba3682ae88e50a971395d57429e9bd25eda53896b129d7605d1b6536f12a0d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d80f477e0---63230106232.pdf In PDF document text
    • http://royalrep.com/userfiles/files/ketofulotebawifawagiz.pdfIn PDF document text
    • http://letdentalab.com/img/files/luzasisuxap.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091617230173499.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/jaxow.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/pikogijuvubomoxizejuzut.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a6ccd1b5ee5a8d91a80c702ab81bcb97/84271638045.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf739400a3---jejonenimagi.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/2156036024.pdfIn PDF document text
    • https://teamcode.net/upload/files/76073301394.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/33688185823.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/63714592596.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/9108224584.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6a073a294b9c4bf5f6ee1e9df6387115/pudubok.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/sokepeludu.pdfIn PDF document text
    • https://masukpt1.com/contents/files/vusofax.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03b70534a---68892649816.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/tijogamamejezaje.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210905194706632854yjgc29xe3hal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=movierulz+latest+websitePDF 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_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 17116 bytes
SHA-256: 3d3aa00f2792fce22f8aaeea2afa7bd331fe5215bb1f492af9fce2312639e861
font_01_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 10444 bytes
SHA-256: 692d0e4ae09abfc32857f50c25050d0f8f30451c6b057c46ea6788ed12dee940
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1