Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0e3eb3c313593f…

MALICIOUS

PDF

82.6 KB Created: 2021-08-28 22:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5eb05d1b7957848d35793288d0e69f16 SHA-1: b5d72746cffda95dca53a83047fa71f28ea92792 SHA-256: 7c0e3eb3c313593f9e44a2594002e44ae8d5c5f63df2059363f4519439b4964d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://saksisan.com/upload/ckfinder/files/gofume.pdf In PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1ed20qhj938j4u9k6q5q2hfk5e/turironewala.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/91977288893.pdfIn PDF document text
    • https://termofriz.rs//files/79774672027.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725e6ae8f52---sawezuzininivawi.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/dirakorewiwoxoxapamote.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5e757600---guradimevugola.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/95836148601.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/berelugosisega.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0657c44e---61289591759.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73dbc2cdf---15012115834.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1q8rnm3v89o20f8b4emo74lqap/wiwaku.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/cd543cd4de2647b475f9a66421ba7a59/3550150628.pdfIn PDF document text
    • http://renovator.cz/files/file/gowufubabixekowidonojetaz.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/9089200225.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/6410840692.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/75121194437.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zoniketos.pdfIn PDF document text
    • http://limoride.net/gallery/file/74569376057.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/wipetofodoxunekapapuvupo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f7142d3c12f---sigemebijurinaj.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e3de45b742fa32e18578598ec5438ad5/xalarosesadomumagiwoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=types+of+conductometryPDF 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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 10660 bytes
SHA-256: 4a78aa59726386c9f677e01892b997f65830157cef77c3c24bece103bda94be3
font_01_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 18176 bytes
SHA-256: fb2e5df6e9b523d646936f9a48cc4a82f7d64fe2dd764e135291c80f4d563131
font_02_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1