Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59b0b157888607e…

MALICIOUS

PDF

92.6 KB Created: 2021-06-26 13:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4753d94344eb9ed97217f27f6d49ce80 SHA-1: 16851796ab5c129707e76e51d0a411f4bb951045 SHA-256: c59b0b157888607ecbbb69223f69475938c579be766a6fe6ed3153ca3ed5cfcb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://chcial.ru/uplcv?utm_term=best+house+hunting+apps
    • https://hogies.com/includes/template/uploads/file/wewaze.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e925ee6b---pulizosowogepofebupilo.pdf
    • http://mya1fc.com/files/ckuploads/files/funofulewu.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4bbfa54f48eb9bd8fee99782a4b6662e/86324131986.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa65505df---90810648683.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/07c8a766650ff7b97cc807070b893df5/kisakirovipukomero.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb01e08b133---12371597725.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863d0dc513d---zemasesezobatejeweg.pdf
    • http://dentherapia.hu/files/file/18516410333.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16089e29bb7823---40004746137.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091294d1de80---kosezobakefeje.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6eadc2869d260102b277ea5728e1b9de/nodukumi.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/99239333923.pdf
    • http://alphasigmaoverseas.com/userfiles/file/81216878205.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e508ad8a8---miguradutukopixipab.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaddad11d1d---92702785160.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/2be677c0740ddcd935dfe1e3c6ed5634/tusozovagonepumugax.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d523bc656f85a50ab122e8f367e61b2f/podekadiguwexekabeso.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f12f49e279---zopolekegigeke.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1aaec676fa---45473061643.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/18fea55f60682ff98ae73e60da8d1734/vufewuf.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfd089193---74700961850.pdf
    • https://securitydm.rs/slicice/file/98284973090.pdf
    • http://cloverpark1959.com/clients/51168/File/5061015664.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4737dd576c---3944679551.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_off0001044f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 16792 bytes
font_01_sfnt_off00011c61.bin
2707bb5c4224df05f27c9041809870d098691272d0808467ba00d9144db991a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 18028 bytes
font_02_sfnt_off00014b98.bin
89c6985bbe3934823ccbd7d6ce05726e7632bf020d0d338cac6802e09063c8f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B98 10540 bytes

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