Malicious PDF — malware analysis report

Static analysis result for SHA-256 c098c1c203a1ec75…

MALICIOUS

PDF

98.5 KB Created: 2021-08-01 14:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0386e91299a537faed3968fd3721d93d SHA-1: 8f82768b579f396301e5a4b1eb486fd618db5c34 SHA-256: c098c1c203a1ec75da391c12a7b221ce19c2a572b37ab0667ad7720b99f9e7cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used to distribute phishing content or further malware. While no scripts were explicitly extracted, the PDF structure itself likely contains embedded links or potentially obfuscated JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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://medvor.ru/uplcv?utm_term=making+stuff+cleaner+video+worksheet+answers PDF link annotation
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/j1vm85u6dmbclsqgoil1p3itq3/todudeju.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97a97dc4a5---52463853097.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/mowajasof.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/75971920479.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/61376181171.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h60alcumincm4i86484ear4o5n/kusomovibiz.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a62fddceef0---domojibumiwusezutiwamoj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4f0768b091a36ef411695a49d433022d/gapufobajikegonenurevo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb32d69d70---jotidoriwila.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077f09ebb3d3---solovodisowanukazanubexux.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/40654692759.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160718c6b68798---joxodowetolagolasej.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6854efd5995b45f1bc90febe14f3e941/85291859984.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/c5lt09gdkvh5lkhu6d03ut54e3/talofuxunex.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jekijemonisedukulomipisu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/qq7f962h04sq00ip6mqv77cc55/takusodemozuxef.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/e6bd54e8ad6e1fd613fbaadd355657ec/92566010759.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qvac2189nqec5p4p8eqkpfthkd/meroluzaniveledo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/afvr39g766dfaqa0jafbk9b6g6/sakojegojagomexibeboj.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/42324817911.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422c40fa19---48469843082.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483e0e2004---90864228726.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a754d6c10f8---66722504578.pdfIn PDF document text
    • https://777mto.com/contents//files/tesofimededebinopigabipij.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a440a4b7---magadu.pdfIn PDF document text
    • http://absigorta.com/E/file/59368012617.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 18244 bytes
SHA-256: 660c4dd4692d0a9f8e49aad2056c34fd9ae2d519c18d4e2f1005ce9b15743f9c
font_01_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 11092 bytes
SHA-256: 1ed8a714a7630614659b9c78af4ad7f3fcdbbee602d021ea78dad680dc250d6e
font_03_sfnt_off000157dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DD 18144 bytes
SHA-256: dd0b0ed77225e955e4a4488bd88ceb5f38d2356b2eb6fe28466eb85db5c8da8d
font_04_sfnt_off00017216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17216 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500