Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c8f081c64461ec…

MALICIOUS

PDF

103.1 KB Created: 2021-07-31 03:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fc9a52f08b93fa14175cdad953bc5844 SHA-1: 99ba88cc7afc166d7f0fb2011e0cdd8eb40ce616 SHA-256: 35c8f081c64461ecd853650e315489c357634e8694ab93969df2f8b1cf879784
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm used to distribute phishing lures or malware. The presence of these links suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/zisal.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c671d288b17---29279895845.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/bikilawifefamu.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/110ea18c7c40741e2dc4d1deb55a50fb/54591386832.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608033ad66257---32602493220.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/15527947328.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/fagurup.pdfIn PDF document text
    • http://samtle.net/ckupload/files/87285990123.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/tetetutuvod.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430143230571242.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b307ba7e77d---bikidigubitagapubemus.pdfIn PDF document text
    • http://beiks.info/public/file/dibop.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/davanabumiwujafamavas.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vpeirafm6ieeh44fqqki9l33he/paromuboninaberuzisevobo.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/10901697810.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/bobenidomewesifipetadoso.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/21828630926.pdfIn PDF document text
    • https://amblamy.ee/upload/file/rugunizulurovo.pdfIn PDF document text
    • http://bjallstar.com/upload/file/zeruvadagubifebokuso.pdfIn PDF document text
    • http://salwex.hu/file/81746137174.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/75861571951.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/88878324890.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/66518524625.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/69526350015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=weblogic+server+10+tutorial+pointPDF 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_off00012d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 17852 bytes
SHA-256: 37cf2135f3478d7b484fc0a769312c241d2c237d173f9fe6eec8fe54e6222d7a
font_01_sfnt_off00015c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C29 11024 bytes
SHA-256: 0ad39fb0e80e5edd953b6dd20b0f637637fc4dd251db99a3481800e931c272fa
font_02_sfnt_off000175c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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