Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc1c7ecc83e3ac6…

MALICIOUS

PDF

100.6 KB Created: 2021-08-20 08:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ef04db37929864d56b90332d101e4ca SHA-1: cd0bb9a24c48965f6bf67b2a1d1f25dc6394a079 SHA-256: ffc1c7ecc83e3ac6c033b5b5993a50efd30bcbb56850998ab0cd10817059af30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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
  • 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://thumpamonpally.com/userfiles/file/45545842243.pdf
    • https://cbconsulting112.ca/userfiles/files/lomugufapox.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/20b36546ba3a4a188b4c9fd4e41a5749/72666058016.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa4355f7b---baxilasopebakusogasisi.pdf
    • https://kheops-so.fr/ckfinder/userfiles/files/dazixuresapasimajitet.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab25af378---lobobejinobeba.pdf
    • https://autoteam.in/ckfinder/userfiles/files/21860474493.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160830c2ddc1cb---40074932737.pdf
    • http://thepnguyentran.com/media/ftp/file/bedemidogix.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/f66d6fa9c5bfc31f75c67a5ee2535291/juneselanit.pdf
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/97332485325.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/purewedejedibubu.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062621572380554.pdf
    • https://mfdesign.hu/files/file/baborejubisinevikori.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a596841a1be6fb1c6907c2cca2344a9f/joludasax.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b317ac42ed---jonogoxisiritibefiduja.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/uf7ep74cjaa113m5ndqe3sjkms/59521881164.pdf
    • https://dlt-nkp.com/fileupload//file/kenopobupoxunosejikawib.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210722055721.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/bcfa60bd6282fb1ea663404e75abd273/puvikezeburezitilaz.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c8fa7d04---92319950044.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=my+cloud+ex2+ultra+default+password
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c66.bin
eb369bb72f39d145ae608ca253d0ffb340da8cf3ea184d8abc4f8e71c3592cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 18972 bytes
font_01_sfnt_off00013d8c.bin
74d5ff912e5206794c4c5add27155c5ce5cf5e1ff194f0a33f59226646a82e31
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8C 16104 bytes
font_02_sfnt_off000152d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152D7 16792 bytes
font_03_sfnt_off00016aee.bin
5234b0834ed8a9193d2faecdb3696088ee232704372ca1b6bcf97e7f37f1c6e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEE 10932 bytes