Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99409a170c5239d…

MALICIOUS

PDF

91.8 KB Created: 2021-08-12 17:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13865c2d8523c78bf6bcef918200d9ce SHA-1: 750326f699153ef1d80c41edcb525f0a00e306fb SHA-256: a99409a170c5239ddb0aabd34c5d76efefc2cd280d35d50496de594682f5e70e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links appear to form a link farm designed to redirect users, likely to a malicious payload or phishing page. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16112bf110ec67---28189425308.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/d3o91fan9k1ltrqfet4r455eib/zamixiratujasemurilinenum.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/22738ad98e9087bd42995cbcc1b0ad4f/jasipofekepabosedexi.pdf
    • https://o-dance.com/upload/files/67635970758.pdf
    • https://airflow-skateboards.com/upload/file/18030743180.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4642fe29---9121286410.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/34204885547.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794cdcd15cc---tolujupovubatumisumezine.pdf
    • http://sicompk.com/survey/userfiles/files/wazara.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070a445ed6de---kofutidositek.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/cbad0473d65cf130dd5e09e491be7be1/46516215903.pdf
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/vinek.pdf
    • http://gtshotel.it/images/file/95542609357.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/49596242ac86e2aca4658bb1c6d7f0a8/majovetog.pdf
    • https://www.algeos.com/js/ckfinder/userfiles/files/karirorex.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/91i917fc598mg22vfrlhq2uvb4/kekimozegirade.pdf
    • http://kapsalonindex.nl/images/uploads/mufolotilodo.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1ersts604fo1b4lb57gu3arfa3/vepepofonisovujuwowudot.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/61263731671.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e432d90c---zizininodike.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd71bb047---68937431492.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/00210da0df585ff20ab839c6e3bd1cf3/78176374726.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9c528f5e98d3b9df116a4eed197672e8/97053041542.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5cd4cea2fe6654e3bca5ba00975fa838/52727105050.pdf
    • https://polnische-zaune.de/userfiles/file/xinikoduxumeru.pdf
    • https://soechi.com/userfiles/file/lifipawurijavutinuxu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ver+pelicula+despertar+del+diablo+2
    • 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_off000101a3.bin
0fca0b1f9ead37da378206fe5e2ae75de003bf9126a6badb76a140fc72e23759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10732 bytes
font_01_sfnt_off00011a3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16792 bytes
font_02_sfnt_off00013251.bin
d213f4c0952f22d3fe371801ffe3d067e406299df044aff14100a6ed6b2b4534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 18364 bytes

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