Malicious PDF — malware analysis report

Static analysis result for SHA-256 912529dd3ab3a0ee…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 06:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9e91c2fa9748753e53f2fd3985f7192 SHA-1: acd0869ca91250d64b95fd971b41e2575d621a4e SHA-256: 912529dd3ab3a0eef699e0ccd66a71b79ae1a8d33f935c544b7607b9796822d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b618bee1b41---86867563922.pdf In PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/97979454968.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/jogezipedinujewovototisu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/fosopirazofilakekuj.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/xazipovasokoz.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/14qovl1cjnncjljar3k8gp3jed/jexidasetapavepujimo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dejuxodixilolili.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2f600b32fdf921cca4772156aa27f348/lodokabesujiwe.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b3bec00646763ab6b88324dcc4d81d83/10262514116.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210714_773616E71C041643.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/vomelalemofozisow.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b792fb6f47cfee20537aa5c4bc70dbc4/9562774855.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d3bd9d7f---pumotosudagiboniwejoxuse.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e0dc5b9a---logenikidijadoziwir.pdfIn PDF document text
    • http://veitali.com/upload/files/sonat.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e0d64ad0805c36d19c5208c8e2e819b6/53597164905.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b728bb834e---netapalafis.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/23338348539.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/52316025073.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/vamajilizazan.pdfIn PDF document text
    • http://stevis.cz/files/file/25494778286.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfljs8lj2g93n99hudn6vbbt5p/97292065950.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/76790779435.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/davipadojoxakelepudemo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535687226c---80476141476.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/nitavuminodisat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=point+slope+form+equation+examplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 18208 bytes
SHA-256: 5d77b6ae7b9b0b449d3468981d3495d41bc903394dc92e1751662bd7d4f21fba
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 10868 bytes
SHA-256: 6abe4e7cd4569d0edcbe18c8da4a056e523de4081d2f3d108e46ad343d691478
font_02_sfnt_off00012c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1