Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6534d179c5cac2a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 12:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddc77e1c2efded1e9088aaed9445e2d1 SHA-1: 7cf6c384ef06360497eae487a9e0535fe3f45f69 SHA-256: b6534d179c5cac2abb14ad2b73116b0bfeffe7219914a05efd5a5d0a4345f2fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=ymail+app+for+android PDF link annotation
    • http://ogcdc.org/uploads/ck_upload/files/20539953189.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/49896663890.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/20003207100.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/gupusuro.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/79406819518.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/49046382245.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/wodira.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/josopetutoxikoxu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5149a2e66---dowumowigisulepup.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/18545572403.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210908180014813.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1963ed32---kejesojadojaramuli.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/1321892021.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/23502252428.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/nupobudosivuwuw.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109151716152618.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090922274596.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/92623538886.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/kozovum.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/3112957581.pdfIn PDF document text
    • https://led7.ru/file/27569725361.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/59049554365.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/govepegosufurodibavoj.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091519214773499.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407a7d2d212---6747177772.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_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 10244 bytes
SHA-256: 45cda9000364619ead8e57bedc04416232b876ce580a917baf195fdacf0a20e7
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 18056 bytes
SHA-256: a8b73f4ca55373c760434b8c7343821b661139e1e65666a92cebf42d88ea5121