Malicious PDF — malware analysis report

Static analysis result for SHA-256 583b16e90a238fd8…

MALICIOUS

PDF

101.8 KB Created: 2021-07-08 22:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f559ddcd44413f46bc966ab7a7acd3cc SHA-1: fc70a08ea3c9217a9ca47ea90f0567ec9531c9cd SHA-256: 583b16e90a238fd80a318fee6c8ae579102aa287d7d83d3f46f0bb195f3ba5e4
156 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 distinct hosts, many of which are compromised CMS uploads or disposable hosting. The ML classifier and ClamAV both strongly indicate maliciousness, consistent with a phishing or malware distribution lure. No scripts were extracted, but the structure suggests the PDF itself is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • 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.
  • 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://roycraft.ca/userfiles/file/67250671037.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c5383ef6734813d9f8a3effe5cdb95cb/xukitasab.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/95616186997.pdf
    • https://hondamienbac.vn/userfiles/file/pogitomotajidit.pdf
    • http://thunderstar.cn/userfiles/file/20210503061134416227888.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c5513d9f42d---doxagukabiruwow.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160961c75f1c03---5779831837.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c413841fa29---vaguw.pdf
    • http://safarang.com/basefile/files/47485888275.pdf
    • http://macautemple.com/userfiles/file/xutumifatuvedig.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/warubegazokalataleg.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/850b4031e3ffee2ecb90e2a3150575c1/risopipuwuw.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17b46d41a---fasujodanuvo.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce51843d44---48158753312.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/nq19u86vqi08a0lpdpchlk1cgm/mezovigiguworofedilapepup.pdf
    • http://cukrarnakolbaba.eu/obrazky/files/11835985005.pdf
    • http://budoprojekt.eu/obrazy/file/12518349593.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1cd9e834310bafa5fb35603783ac4d34/tosuvowawatolutamuvus.pdf
    • http://inlygiaylynhua.com/upload/files/mevixexibesapigefizan.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7dtpplr3h03ceh5et9dn1knobn/muwilepobowonejem.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e037f999db8---matogukisalatonovepu.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ee9c84dd---98990213310.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/g3cj2mcqs90uv1r0gq85btid86/44287844944.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=jorge+luis+borges+the+other
    • 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_off00012b62.bin
343755e17a390e348f77821b64bf677212f930b254efd983c1bdaf9db4faa4f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 10352 bytes
font_01_sfnt_off000142f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142F1 16792 bytes
font_02_sfnt_off00015b03.bin
2ac6cca76f45034bdb25989eacac2bddcd47864ef684da178260501ca4779b02
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B03 18044 bytes