Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5f9cef8ee6ff30…

MALICIOUS

PDF

65.1 KB Created: 2021-09-15 14:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9c8930a2eb998384929278ac0d017d9 SHA-1: 32da5bf5b08375e621cd11becdca13b1fc14be4b SHA-256: ba5f9cef8ee6ff302b735c194927afcac3edd6bb744c37752b136ef52d59fdc4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate the redirection or exploit vulnerabilities. ClamAV detection confirms the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3110

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://infrive.ru/uplcv?utm_term=experience+sociology+3rd+edition+free+pdf PDF link annotation
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/togazalisolabo.pdfIn PDF document text
    • https://everestart.com/images/stories/file/pivizavejuba.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613de42d14508---suteremufozelitarezali.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/jadonibenonuwawuzeli.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613772e48a6e0---tiwabavafogiwirugoras.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/49654396712.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210915_F7A4474CE71C2223.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/62012772213.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/jakevoniluxigarakafiben.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/vinufazufujode.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/xuvurexanowedub.pdfIn PDF document text
    • https://petikdaun.com/contents/files/zixasasemijumuxubav.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gugifabopipowumijimagafi.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/23236883018.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a6eacd23af69d845bd2f8680e431c579/tigonunemoloxelav.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2n701cssd7hl5q2ckfv7snqvof/26012696101.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109101950258677.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/lavako.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/dizumipevatenu.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/69795064613.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109010314533854.pdfIn PDF document text
    • https://renteci.com/imagens/file/78876944695.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_030825_194.pdfIn PDF document text
    • http://chengzechem.com/upload/files/mikovinapafojisazubajud.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/85693246267.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/33209161214.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2E 16020 bytes
SHA-256: 9e009ebef2190b401b62d8e6dec33a03672a64652cca9f0d81dd9d1b19b93c8f
font_01_sfnt_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 11004 bytes
SHA-256: 3f6b096c13ef54b3e9e04a651d2395e62b35abd5cd3f05b7dc8c76596f1afe16