Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2ca5d063c7f2df…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 12:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 86b7c0c1cab1d9eb8c0d83a205f5df6d SHA-1: 0ca78b9499fdaa2bfc5603cdb6aa0dc9c415e615 SHA-256: 8e2ca5d063c7f2dfcac0b7b7fefc56e6c94bd0ed5fda4e0b06c41d0b5f2e0118
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting users via these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.ccs-corporation.com/ckfinder/userfiles/files/kuzide.pdf In PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021092821243073499.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/kafilu.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/vikabovizikom.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/lizagemipenuxupirizokevi.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/tonemafarunef.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/gefupojimapuxarak.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/76592054163.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/2109428448.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2ace792e1---viwozisiwu.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/31977481956.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140646455a3c---lafududodizepozo.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91980003185.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/35685763704.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/37547519023.pdfIn PDF document text
    • http://fitviewer.de/files/file/45508387337.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/fipurebagukakoxowikula.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/6383857295.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/30964612789.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/xirubesoxaropogebexexegu.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/65709985603.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad323c27ad---11582370769.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/jolasatusomezimo.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/38697511270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=roblox+tower+of+hell+cheatPDF 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_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 10440 bytes
SHA-256: 55efa84a18d13e0b8b96c33bc343e9679ee60d21e5dac5bd69c9969962031f24
font_02_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 17372 bytes
SHA-256: ffc7c766321578f5e95b07808f117f5d8e4c31b41c2ebfba348643ddaf46d976

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