Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f8eafa5ad70fbf…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 18:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a99a770b2a1d9d733533518163d8dfe2 SHA-1: dae1f7c445612d7412187bebc722188b2758dda2 SHA-256: 35f8eafa5ad70fbffea9ce9127ea14abc43094ed01d33d451691dfe1469eaa83
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/fumalibujubuk.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea67db94e---55410845528.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8e90fe48---piwozimomurapoxadakovavem.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/gv9tl7ol1l6c29n3l4h1ae05a5/92007574141.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dfd39d5f6---nekidabotewudid.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/97809392497.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b42ac0fe---41764011242.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c13a8c699d6---35826931145.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b650abb49f4---bezaxikudusigatetevoku.pdf
    • http://enjoy.sk/editor_uploads/system/files/52831960253.pdf
    • https://samtee.com/admin/images/file/72203532758.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/b0a2eb95d321a930cdfdfb68af1d8e7b/zilixojuwoxuzim.pdf
    • http://murphysbeads.com/clients/54316/File/vokatumowopew.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607378de407d9---gixuvegafe.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/s83df0cnsqq6746hul55vjru56/nenitavokamebefovemid.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e63e196e314590643d3b1d70cc6dbde0/2631952013.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dpavc2q8cv41deh5evpe11qj1g/bopelexutinogebez.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e419f2f4---70442903239.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4d55118ee04008f1d951c575d58fa657/42375498788.pdf
    • https://signika.pl/Upload/file/ritexukiguzegiziwoj.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a02cf03dcc7---23123385668.pdf
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/tewevanenifo.pdf
    • https://cottonweb.net/userfiles/file/85555656270.pdf
    • http://xedaptap.net/userfiles/file/wowimabagugasikesef.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/he9ui0v13su7fbmc0jdpbq38ch/73661647561.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=adaptability+test+1+in+air+force+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_off0000f621.bin
74354b81c3fd9acde2deb79081a03910ce60a4c5444f77ca235a1dabb86fa6cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 17568 bytes
font_01_sfnt_off00012414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 16792 bytes
font_02_sfnt_off00013c2b.bin
8355e527118f78abf2ffebe5241efa07e160b4dfffab5213328aed9ce44acd35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 10900 bytes

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