Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ba36069724849b…

MALICIOUS

PDF

78.5 KB Created: 2021-07-19 20:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba3bf214961b29ed3a7897e888513ba6 SHA-1: 65db535164a8b312ec23682562cb33ab416e584b SHA-256: 21ba36069724849bbdaa1e88d15d6c8d0310fe2bbb2e56c6020ecf867e319463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d85383b07e7---84158754006.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1tji60au5ig9ojmkfb68qrtcde/20120587534.pdf
    • http://progfin.pl/userfiles/file/bozezologigobebitaza.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/588415bc0e99a2d75ff63c818037a0b1/dagileseboginemamiso.pdf
    • http://premium-t.info/files/files/76709548331.pdf
    • https://glbtrader.com/userfiles/file/98770303828.pdf
    • https://perfecthospital.org/ckfinder/userfiles/files/rixapurifenavizeka.pdf
    • https://cabsfromheathrow.com/userfiles/file/kovasetaxigi.pdf
    • http://nail-free.com/ckfinder/userfiles/files/nowujumanixijetitesos.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04530e1ec---watenuzevasijabi.pdf
    • http://faxik.ru/ckfinder/userfiles/files/91793890692.pdf
    • http://yejida.com/userfiles/file/lipirojovuno.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/b9pqbhfu85ka4g2giinecfe0ns/ruzatekafuzunu.pdf
    • http://skincarebylaura.com/clients/862251/File/30639994993.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90df21e79---63914116102.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086b248d6363---rugar.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/bukok.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qf9uerko9364dj5etnafmdlr89/81408629011.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96452bfde---ruwaropaparamaso.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c1lu12m2d0ugdos5o2v7n0rpe3/2187722690.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609437a82bd16---puzativoxikabixaro.pdf
    • http://jarosi.hu/files/file/36688108272.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=non+veg+cooking+books+in+tamil+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_off0000d005.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 16792 bytes
font_01_sfnt_off0000e81c.bin
d6db37469c7c615f484f5905c7782d4f4cdd6a2a5cec75877925e1bb95fb7604
pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 11140 bytes
font_02_sfnt_off000101ba.bin
341cd8df9e1f5779b9e1d1ad4d23b4d7b90850db1db6df5dbcc6676b7dd42cda
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 16488 bytes