Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae00e338a18f48c…

MALICIOUS

PDF

81.3 KB Created: 2021-07-08 12:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2027be928f3f96b9a3a701cf49cd9f5 SHA-1: 9fcdc4e23946a6894674c7383245376c8058d40b SHA-256: 8ae00e338a18f48c0db847cc31456089ff3deab6beba855d5b49da81e83fb22b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing attempts, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://naucharts.com/ckfinder/userfiles/files/jepesidufonupavolitameti.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca18fa7c99---sexaz.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/lagugaxajekal.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/468f21c014ca620e6846b0d03f9bee1f/24375030250.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fcdd34f6eaf80e002dcfd0119c7d34b9/gagozeletorepadalisuleno.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bf439b3dafa64976d58b1f827d9cede8/wenazunijifadov.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/98122039000.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/bokituzafomibukevadog.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/556f96329fd3235a1005eebd5c3b5f22/xababerigawaxulu.pdf
    • http://amajyuku.com/files/files/35680048321.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c8cccc78---33923139921.pdf
    • https://agentcctv.com/userfiles/file/rubojobarodizizixijesak.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d20b00364---21409350438.pdf
    • http://timebymtm.com/upload/files/52494592144.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/b08253d5c75a215f558c79a7f1d1c367/vitamefodivijak.pdf
    • https://hostingalani.com/calisma2/files/uploads/fuzariwazujezopezizaxexo.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096de552e29a---waguwozipoko.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f1deb80c3---tekuvokozogi.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/25ec4cfc4cd66776ccb22233d973c6ea/12013753911.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d503c344e---46818078613.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/43484340608.pdf
    • https://sunarchegypt.com/userfiles/file/49964519357.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/248409bded831c259e71cf7357ea91a0/bixulo.pdf
    • http://mid-europe-ex.com/images/blog//file/turaxosidukef.pdf
    • http://korean-school.hu/hangul/userfiles/file/selemadomisut.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45b5f8cf08---2908390417.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b43afa35bfc---37060969062.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=record+keeping+in+poultry+production+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_off0000d98c.bin
59fd6132986c7ab8931515a31edf282187166136414762dd2ac4d43e2c25f596		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 10816 bytes
font_01_sfnt_off0000f267.bin
4b22d19c2d9dc0586a5182fbe01bde4c376f653f7c7a1d914c9823d7f44dc584		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 16708 bytes
font_02_sfnt_off00011dd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 16792 bytes

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