Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09e6cabc9dd0044…

MALICIOUS

PDF

98.4 KB Created: 2021-08-04 07:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2c1cb42a18841c01f2ec0bb0ecfa6c7 SHA-1: 27ac4786bf27b1c3a9ab834df38838b2d709f6d3 SHA-256: c09e6cabc9dd0044e302fcd8f8679357b2dd079e0b8a122b0c88ea290018da5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple links on disposable hosting and compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/rue6o8222uim5tgtsfbnq4kc28/kulatejelubozamorusikamo.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/49d614ac9f22eb3947427a477879da79/54899723680.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e7780671---suzebag.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5f23b7128c984851eaffe9b8809628af/fuxuxagolugorej.pdf
    • http://okna-stv.ru/userfiles/files/1969117474.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/25751ebf62c5e898fbfa13d18b6dfa38/vosereg.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40f4ded24---basinukumuzepobaditak.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/vobisegigetaraxifijofe.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a539e1ac38d---2326984161.pdf
    • http://apexibd.com/uploads/fck_uploads/file/sebaz.pdf
    • https://dcimx.com/files/34600440151.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e45b53f5---69373137447.pdf
    • http://animationcoach.com/userfiles/file/37389889972.pdf
    • http://udemadriatic.com/userfiles/files/88672360722.pdf
    • http://angerdress.store/ckfinder/userfiles/files/92422650131.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a286d1550f2---26537934756.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1c9c0ad2853f12c84f32fd1cf3f893a1/8069837700.pdf
    • http://yucehukuk.com/resimler/files/wiwuzene.pdf
    • http://palaciodelosnavas.com/userfiles/file/muwaj.pdf
    • https://diaochue.vn/userfiles/file/6528214352.pdf
    • http://envigest.cz/upload/file/foxejetukum.pdf
    • http://vom-ragnaroek.de/uploads/file/4771444773.pdf
    • http://dragoniresorts.com/userfiles/22893926989.pdf
    • https://tyko.pl/userfiles/file/29111781175.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=az-103+microsoft+azure+administrator+microsoft+official+practice+test+download
    • 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_off000118ca.bin
faea86d3e2e929aa6605a60d1e21f07ff7576075745ca766cefbac966323f23a
pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 17376 bytes
font_01_sfnt_off00014682.bin
5d8cadb83722025723e4507368569cf772f8534476a825376a05254544e66bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14682 11388 bytes
font_02_sfnt_off0001618f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1618F 16792 bytes