Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3503e319741ce34…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 04:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 951d4c3bfd759bc4a299d1bb058d9032 SHA-1: d56afdd41bbd6d64ee200c74a4889b97fb83549f SHA-256: c3503e319741ce3470c3ff1bd76bef084674dcc417f4956994ef8a10cd92a5f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various PDF files hosted on different domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a phishing lure aiming to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://seedcambodia.org/htdocs/cljr/data/files/92136514377.pdf
    • http://webhenevents.com/clients/868374/File/89506973609.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/98f48e084p5vljsi1ts02eijo9/95849053431.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/9718924511.pdf
    • http://iphysiology.ru/upload/10595224752.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/juragipuguxoxeraj.pdf
    • http://aristosaigonhotel.vn/uploads/files/latafefopimunafulos.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905987eb978---58875199757.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4ed58e57a653a2485ad2d1f3b6024f44/52991808932.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4c1q1j3gl50otd7tufmbp5idt0/76865227152.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080979f08c10---98177252084.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a921aaa2266---garix.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/safizofawijozufalelolero.pdf
    • http://coolscape.info/images/files/14722194188.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237f5502eb6---zafodopuxotufexuzazukobat.pdf
    • http://sugarfree-gelato.com/upload/file/67662935784.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b0fa3677---59658486082.pdf
    • http://i-harmonics.com/upload/files/golerazoturomisu.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kafetebatutetegasobofe.pdf
    • http://cec-intl.ru/app/webroot/files/file/mutexinebelifusuxitore.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/wofuwabiselopemapalediva.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/eaa494817542e077250a3e2a4602bc3d/xoruzofazexumukikojilijob.pdf
    • http://goodmix-psc.com/userfiles/files/90843974909.pdf
    • http://alexlunacoach.com/img/editor/file/83175305241.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+shaders+for+minecraft+pocket+edition
    • 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_off0000bc6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6E 16792 bytes
font_01_sfnt_off0000d480.bin
921428ba8f1cafa65b13f8c2f15ae44b17962ef7191584a4eb8707e97cf0f871
pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 16888 bytes
font_02_sfnt_off00010022.bin
a82f39f7b69f5dc5d7a69ec057f6d8fdb8b12ce64f30df33d38fcaada89698bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 11064 bytes