Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f56fb92aa6cde9…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 15:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4324ce074e1f0b2c214085f29013bcc3 SHA-1: 1c09dc14b72b7b494345bc1bf22b87b737994ab5 SHA-256: e6f56fb92aa6cde90fd4f069442f83082bf25e0a20959d18d37ef953282ccf4e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bouncebodysupplements.com/newerac2c/userfiles/file/fipoxobowok.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160968e2b016ef---bajodif.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a11d9f948d7f62dde2623e2cf5d61df6/94684063279.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/njbjcs78ofnegg1bsmuu00l013/riwalemijis.pdf
    • http://arohitourandtravels.com/userfiles/file/lupeto.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/df4a4875b9634121796f8cd398f8f277/xumezilomiwagen.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/563ujeis9b0pec9tfq45nf1ne2/80906049173.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd21a71f4ba---59228500249.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608468a5161c8---84301448699.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f757f12047da19300a5d88cca83eb0eb/27568501480.pdf
    • http://russkiivopros.com/images/FCKeditor/file/lawupa.pdf
    • http://caphegiabao.com/upload/fck/file/40079697481.pdf
    • https://7gking.tw/upload/files/69416667369.pdf
    • http://botosani.ro/img/uploads/file/80845460490.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ea6428b982678881bcd24f98d41e154f/58101936300.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=medicine+used+in+nebulizer+for+cough+for+adults
    • 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_off0000ebb7.bin
514614f0cbe8b99088129dbd346bc5d1f1f1930a1596e84d1a88caeb5278023e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 11048 bytes
font_01_sfnt_off00010527.bin
e987a7b03ea0950e60f2111f3954858db372ba503798d61cf8c043b81b02d187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 17404 bytes
font_02_sfnt_off000131fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 16792 bytes

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