Malicious PDF — malware analysis report

Static analysis result for SHA-256 480357c65a2c9b52…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 04:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf364db7113e2cb1540f9b62ae18a155 SHA-1: 70272a6f46666ee4de2d78ee401431667f80378a SHA-256: 480357c65a2c9b5285474b8913393729ea75cc5aa8fe80fd816ab04183d6d999
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

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://infrive.ru/uplcv?utm_term=cartoon+city+2+game
    • http://benetalent.com/upload/files/mofoturemolomotogosuxupi.pdf
    • http://diamant-x.sk/UserFiles/file/30820621195.pdf
    • http://effektfilm.de/files/file/4101631662.pdf
    • https://gmt-tw.com/app/webroot/userfiles/files/wipivaburewokowosimobomiw.pdf
    • https://zenithoverseas.com/assets/userfiles/files/bujenupigujabavanabul.pdf
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/zezazazuxate.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2dg2ogn7jv5mujf55j55mct11c/gelumafojagagamitu.pdf
    • http://ooexperience.be/assets/Image/files/dabegutejiroxupi.pdf
    • https://lee-trading.tw/archive/upload/files/31689332295.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/gowofabipadododowufaduxoj.pdf
    • https://lawweb.info/mycms/admin/userfiles/file/gitowute.pdf
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/xiwinidumerem.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad3b78e46---28475973223.pdf
    • http://megalabsrl.it/userfiles/files/sagina.pdf
    • https://bda.ch/ckfinder/userfiles/files/59978111851.pdf
    • http://xtra360.net/campannas/file/29056270060.pdf
    • http://ambvet-trefontane.eu/userfiles/files/rivanuli.pdf
    • http://xsjprinter.com/d/files/sesefarajopefixitujusim.pdf
    • http://bukhatirhomes.com/userfiles/file/saxuvamosa.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c2cc99069---nidofonokosut.pdf
    • https://esvigo.com/upload/files/39112234003.pdf
    • http://mictrogiang.com/userfiles/files/68403514677.pdf
    • http://abwlondonblvd.com/uploads/files/29293754067.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_off0000fa16.bin
a02a7e3b4900482179f0f324d2293204b69547963f734f67cf962c6fb17cb03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 18184 bytes

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