Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1456dacfebf926…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 07:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c16c1482d23b76d8e096216f179cb8aa SHA-1: 85a1da4417660889c43cac6407ba26b9aea464a9 SHA-256: ce1456dacfebf92660cafcc25619667e90018f71884657d97f89c04acd9c95f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=crear+juegos+para+android+con+unity PDF link annotation
    • https://haltia.mx/sii/ckfinder/userfiles/files/72358244289.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161314771b4cae---83120451844.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/vopemosetakatefanixiw.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/99975643408.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/12311218692.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/nutosenikisox.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/vajikaweziriwuzikage.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/nubuxepelozivexokises.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/bejujikanuma.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/2311929069.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/xikezorugozuge.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vasenigoraxuko.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135180548cea---dalozugoniresixuxovid.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/bovalutepiboridexuput.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e40c017d434d476be084ecd20c55799a/66798675771.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/meloregixesiwovawumi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bb97025949b420c88cfeab8b13807eb3/32149857110.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///6085486311.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/28838948777.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161460a1d8b4a0---zefijujixivawekogujuseban.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/29003297563.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/lotonurar.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/vezudoxuselaravirumi.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/gujopi.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/5302803490.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e087b1111---vawolodaluwinetur.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_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 11020 bytes
SHA-256: 3f6a7f1ef09fabd1b858f0a7dbdb825b1d7c94a53ba4c7d3885292dea3e1bf8c
font_01_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 19452 bytes
SHA-256: 83200799cd2f3a4fc9ab2eb805eb5df405da1306824050fa653691ffc803c629
font_02_sfnt_off00012922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1