Malicious PDF — malware analysis report

Static analysis result for SHA-256 387c2c04f4bc5b98…

MALICIOUS

PDF

52.0 KB Created: 2021-09-30 16:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f69f013b7c5b1dea92d277e2ec235e62 SHA-1: 30c86f95b5893f06864980698d1edc1c2e1db686 SHA-256: 387c2c04f4bc5b9808200d129f6fa52d5346dac6c843d4d671728abf7c745a72
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and a link farm structure points towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8497

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=little+panda%27s+farm+story
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/73032950054.pdf
    • http://smcertificationservices.com/userfiles/files/pajawajomuniwinapegazepa.pdf
    • http://roseeskin.com/userfiles/file/20210925163658.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/54502516874.pdf
    • https://clubkdo.fr/img/pics/files/xagavawek.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16150bad16cb33---82280785064.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/350565e611211712fc12500c7d7c568f/zixagevarogujivegamoxiw.pdf
    • https://ldoris.com/upfile/files/20210919025632.pdf
    • https://thuaphatlaihanoi.net/uploads/files/92138210898.pdf
    • http://thenext.pk/userfiles/files/zigajinefojet.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/damejemazetakuxanozuzovir.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/30539054336.pdf
    • https://afayl.com/userfiles/file/14828940004.pdf
    • http://esangsok.com/upfile/files/gobise.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/09225436c02392d5f23a0fabe1940134/nodonudatogusonekanobo.pdf
    • http://chafewyuok.handysociality.com/upload/files/24477937506.pdf
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/jutiwebivokijunanigikin.pdf
    • https://sin-wa.tw/app/webroot/userfiles/files/94662409424.pdf
    • http://fanti-fitness.pl/uploads/assets/file/fadixolojalapijolida.pdf
    • http://robwalker.net/fckupload/file/midobiwifaxavowo.pdf
    • http://bienbao.org/uploads/files/sufupiboru.pdf
    • http://myblindz.com/fck_user_files/file/8182454657.pdf
    • http://juicy-group.com/editor_upload_image/file/lekaxesumevadu.pdf
    • https://kiofruits.com/admin/uploads/files/42732711121.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_off0000b293.bin
e6319a6cd451686772a3c2ec3215770cbdfd7daeb830cc903272fb5421dfd497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 10764 bytes

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