Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bbbaa56224182d…

MALICIOUS

PDF

82.2 KB Created: 2021-07-20 18:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 26fcac801e5270238f53fbe5ac360d35 SHA-1: 23b1b82da30409c94eda5f070addee0df73c3d87 SHA-256: c4bbbaa56224182db44f9e31d4ff2c11c21a532e73c101d1ade206d98fa319f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cuanhuaabshanquoc.vn/files/33496851299.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6de3234aeb8896ad2b51c76e5570a376/16404167379.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/suderupiwabexukur.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/11593372776.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/34812119530.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/75655681705.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/sorexor.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/opl39vf61hla68lre10s3t1gk7/sotatusagiv.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/loxeluxafob.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8e800ff6a9390e85d7c2863c0ca910b7/34699649864.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/32squsiu7erda42jd57qbhhom4/rowukiwe.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/10668525381.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/matokaliwilivipovegivebig.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f0b801c8284f38c1bfc6dad986b30440/62700710896.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/zazoxerujerafid.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e6475579868---62691985569.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/ditijobunikodoju.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b44f74865---54069162777.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d42ad6e4f---lofegako.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ec3786ea---nekeju.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/baruvo.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/padigejazamemowupanowojew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+sun+and+moon+ultra+legends+all+episodes+in+englishPDF 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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 17480 bytes
SHA-256: 9b3b7da29e1b701fbf3cae5c7ff5b68bc6b058dbe076d18e64f6926368c4e21f
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 11032 bytes
SHA-256: 69839312431bc4e7008ada8e0134aababdc03deb2a301c44f2a2d9362fe606ca

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