Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b024c7296ab3ed…

MALICIOUS

PDF

64.0 KB Created: 2021-09-23 17:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 123aa9e4e0a59cdb9bc658d8264b6a36 SHA-1: 8755722cb96b02bb0947b202f7ff2607cf4f9b3d SHA-256: 99b024c7296ab3ed26624b4fd279c5987b8ee34a4ef0a3d432f072ccecaf61d3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the presence of multiple suspicious URLs suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 4

  • 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
  • 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://pixomot.ru/uplcv?utm_term=asphalt+nitro+apk+hack
    • http://duet-czluchow.pl/userfiles/file/85295765127.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fefe46d8f9---fodizaxofegazifirajerox.pdf
    • http://malagi.pl/user-files/fck/file/ruboxok.pdf
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/koxexaronetavisarejepowu.pdf
    • http://objets.immoweiss.lu/userfiles/files/5257957525.pdf
    • https://printjet.pl/pliki_user/File/95478236305.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/jebogatumema.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613472e9d9cf3---42218544869.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e433b7224b---lirijizugasujizuni.pdf
    • http://style4.allwebeasy.com/userfiles/files/gopokele.pdf
    • http://summitremodelinginc.com/userfiles/files/jafojaz.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/dezizivetima.pdf
    • http://urbancollab.com/userfiles/Proj_Name/files/dikepisewesidekike.pdf
    • http://zhouzhuanx.com/v15/Upload/file/2021912526303452.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/27055074418.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614973310646c---25263437058.pdf
    • http://blccy.com/userfiles/files/51180086633.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a5157827d8c44671e3920c9a6ea8b35a/padexofebebisir.pdf
    • http://ashioke.com/images/library/File/senepuzu.pdf
    • http://zenithmetals.com/files/xofuweje.pdf
    • http://hanaelectric.com/userData/board/file/44242964709.pdf
    • http://showdoimovel.com/files/files/povule.pdf
    • https://felicitareonline.ro/ckfinder/userfiles/files/55827216831.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d797.bin
d768c9b0a08aa6993fababc3672d884b3dcce78ab61214c1d7900f7137aa2ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 10412 bytes

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