Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e5e41ddea13a35…

MALICIOUS

PDF

73.1 KB Created: 2021-06-30 16:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bebb984147614d611f079ca6a0d9d81 SHA-1: 0b955b09ed0fe280580bf6628c7d21449d04cda7 SHA-256: 01e5e41ddea13a35335555094bc5590ce7e237d478c734c3ffb60072e2cbd4a7
96 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to redirect users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://tekmaker.com/upload/files/67816403976.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a4b788d4eccd1cf8209f95044380b56f/37242608155.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810e8e21bd4---7497109246.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f93382aa71007d18651fc4c52fea33d0/joruleku.pdf
    • http://yishiweb.com/upfiles/files/20210531_011108.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4374b42bbd---wewatogimav.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43416f580---72393597624.pdf
    • http://www.findvoters.com/userfiles/file/xidajomarit.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609475f370c27---poniberagunoti.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf27b1aa7---viviponuwidamepadiv.pdf
    • http://recrute.fr/files/files/63236043589.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf21f5cc58---kubezufalo.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/61788934757.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a029a8d233---56506189149.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/83fab7e3998d29e77d6ff5525da9ca4a/12067413012.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5412ec45a7---73406751763.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609435b846102---robafapukin.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbed483f9ed---90853591928.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=for+since+present+perfect+exercises
    • 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_off0000b986.bin
a3b8bd71158032420d28426e8ed3a9769dcebd486a89365fb20f17e41ca0882d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB986 17024 bytes
font_01_sfnt_off0000e614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 16792 bytes
font_02_sfnt_off0000fe2b.bin
850184e0fab311fddc4872393f4abe6acd000bbb1477cb5008a35584417f2daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 10344 bytes

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