Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8a33f40247821e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 21:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4d771ec0ec5db64d444b4d2706bdbbb SHA-1: 041f211936a2384590621e872ec4035b1416326a SHA-256: cc8a33f40247821ea6a22516f004cf273109d0c3ec7cf5cb3dababdffe5f912d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to redirect users to further malicious content. The presence of link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b53315eaf---11884863765.pdf In PDF document text
    • http://medicalproduct.hu/images/files/5967844081.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/89173461877.pdfIn PDF document text
    • http://jsdarvin.com/files/64991254960.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/39541043129.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/rujinafomenufuwivajelazo.pdfIn PDF document text
    • http://djapm.com/userfiles/file/mubado.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/824466f89b0e232e59a33d931d1ffdd2/nodagix.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/wimupamipubadu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/36897657041.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/49622053412.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/2128566624.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/33684159406.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/fikubazuxadugolom.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c316d13d28ac1603d5d7f1da0ead24fb/piveguv.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5a9f1be7---zelutuforava.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/45520127871.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/10268169919.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/kadimibokonigafovozi.pdfIn PDF document text
    • https://superpart.com/files/ritagubafenofobafam.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/95096299757.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161385e12d8ace---19238785263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sia+cheap+thrills+download+mp4PDF 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_off0000bf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF71 11016 bytes
SHA-256: 6283ad1a09f9ee2a6e3133d83bd3b50974b40026df70bca3dc3fe45eda5162dc
font_01_sfnt_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 19316 bytes
SHA-256: 1e8b44eb19e075ff12b27ca4295afb0fc381d2b9e7794f8e43a14ad14f52016d