Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8b9d217fa84ecf…

MALICIOUS

PDF

97.6 KB Created: 2021-07-01 18:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b73e0d04565cdc19b1d523630a622f6 SHA-1: b71be85c76c3634bc162b2cb30b92fbbdaf1cea5 SHA-256: dc8b9d217fa84ecf069b1dcc3b16f9332db78842fd467af20c921a735707079a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is likely used for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL structure and the ML detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 5

  • 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://poolpoint.be/uploads/file/35845429051.pdf
    • https://ifbscalidad.eus/files/galeria/files/5566817126.pdf
    • https://eyetracking.pl/userfiles/file/23720445081.pdf
    • http://pestcontroluttara.com/ck/upload/files/beveso.pdf
    • http://aliceinformaticasrl.com/user/pages/fetapenorexite.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/48e6a23914e73f6db598c5715d8850f4/pufoselekejor.pdf
    • http://nesthomes.in/userfiles/file/bipabegegum.pdf
    • https://webtechnocrats.com/upload/file/xezazufamoliraviletuzaj.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b28270d278---29459782190.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bekuluwanoluseguden.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608738be1de7a---28805896658.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc79a49202---vixetowabija.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/63240440049.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4330b39f50---sobisipojikukufefijad.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c940da9a14c---fomorugosopokejem.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9eipem925nbon783t1hj4h69am/kezute.pdf
    • http://studiomanzella.com/userfiles/files/81360801882.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b368cf9e---59465212158.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9dd036a7---nufuduvoxupo.pdf
    • http://matras-devison.com/upload/file/kamulurari.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629f713e31---97229200110.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4039c4ae98c93f71dc6a0eb20b9f620a/9051737300.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53a043c79---getaxuripeleduji.pdf
    • https://candbco.com/ckfinder/userfiles/files/9054144781.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=diary+of+an+awesome+friendly+adventure+read+online
    • 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_off0001185b.bin
3cb1d7efdbd4fecef665e9391e2fbf65b86a7205af9c931d21da6bf39c517891
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 10880 bytes
font_01_sfnt_off00013197.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 16792 bytes
font_02_sfnt_off000149a9.bin
04227c0e6b6040f717f9fe4d0ea108f2a0f14880aea524a46610710f3406f230
pdf-font-stream PDF embedded font (sfnt) at offset 0x149A9 17748 bytes