Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb66bc54a5fd2e8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 23:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afa5e94d349740f91fd59fb41febab47 SHA-1: 6e9bcc9c737ee4029f99261275b1425af8af3f30 SHA-256: 9fb66bc54a5fd2e8bf0934edd70a332072827dc053b1f121506a3e74f6a7ce26
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. The presence of 'utm_term=oprewards+free+robux' suggests a potential lure for users interested in gaming rewards, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=oprewards+free+robux
    • https://bluetact.com/locktactyuma/userfiles/file/vemekil.pdf
    • http://daming-school.com/userfiles/file/mujilimu.pdf
    • http://tcsklife.com/filespath/files/20210924045656.pdf
    • http://ubestsports.com/imager/files/20210901050539.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec7372ce0---xoteledixelu.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/77792020002.pdf
    • https://loyallcanada.net/editor_files/file/45766870379.pdf
    • http://ecilingirler.com/resimler/files/tatevojoduvufofilufa.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e850bb9960---83026182510.pdf
    • http://hum-lucknow.org/test/fckeditor/file/67317193189.pdf
    • https://full-e.com/app/webroot/userfiles/files/20210923_003812.pdf
    • https://argumentua.com/i/file/74967688078.pdf
    • http://liweisteel.co.th/ckfinder/userfiles/files/pudobosugibudusubaxigu.pdf
    • http://laros.cz/UserFiles/file/1460741274.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/30805229418.pdf
    • http://lt101shop.com/userfiles/files/50459539402.pdf
    • http://proreferee.ru/uploads/ckfinder/files/jibutedip.pdf
    • https://gruppopolidori.com/upload/image/file/bogevuvaniludusuxutu.pdf
    • http://gift-founder.com/archive/upload/files/motofokabimuvilasoxubajip.pdf
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/10127270423.pdf
    • http://twilaw.com/files/files/totike.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7e4evlsehhnrrkgkjg5uo1bsri/tamenazukexavo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b405.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 16792 bytes
font_01_sfnt_off0000cc17.bin
0c64718668486786604509ea3750e9dc1f772f8a4f88e7deeb91f367733480c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 17880 bytes
font_02_sfnt_off0000f9d4.bin
9b51c23c122327e58a5cf3792ece3e591f6f59bb78eca70591817bb5fbf9d017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 10604 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.