Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5c501b5054c611…

MALICIOUS

PDF

100.5 KB Created: 2021-07-27 06:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c865bd65dcaf2788bea4cc8bfc45eb5 SHA-1: dfcccec8ce8061e04391a6ad5db8a1185f77341a SHA-256: ba5c501b5054c611510e0f517e6c352d3c0a771267ddd208bed8126a7f1558be
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. This suggests the document is designed to redirect users to potentially malicious content or for SEO manipulation. The ML classifier strongly indicates maliciousness, and the structure aligns with techniques used to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1cctk9m8lbfitmpfr9ivt6fa39/josukides.pdf In PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/061891d077945d3f9df84f3ced855a7a/xuwetotige.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0piosibbvn6f1bltsmno34hvpp/77821707985.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e335a394f5---jeximu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/085a3a60c88939af2a38ca930e32877b/77885541311.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085668aa0863---38523151939.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qmg1mt53b2g6gensoufu9h2i00/zedube.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f9b762b70d275709a0c66c1db5ae07e8/pefubidudop.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/71330477594.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/89440757482.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/25552250689.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/44455197600.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/15755949512.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a328758ad47---jadevefebamozununu.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/79610052568.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/954a2180ebb232e7148f0cc5f6a30c3e/muzipuxoxel.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/94959260470.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/4b3660d098c70ebc33fdae22165826c1/sesibaketadafuvubopozi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/k86n4ekjoav05f9dm8i2phsd5n/kuvefonulapizeloduwap.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/49419094359.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0d6d7db5---bomad.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4c2bdbea---45821169617.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/riwefipoluresalugutogugik.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/366f26df05a2f88b1856073914b7aeff/dimesanafotezilanukali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=isolated+footing+design+example+pdf+is+456PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 21412 bytes
SHA-256: d30fac4b172a5756d9ef4829ff5a159f5ee378201df7460f45558e15767e744e
font_01_sfnt_off000139b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D0 11176 bytes
SHA-256: 7b990d61ae4961d1bbbabd7d5a2a942b236df6521738c540c30fd5d9106c93db
font_03_sfnt_off00016bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BCB 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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