Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccd6d7fcea06bcc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 04:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9654fee56c5c6f067476b48e469a6ee SHA-1: c9d79e987a28c0295fd9d27c6243ee97748f0eba SHA-256: cccd6d7fcea06bcc10fc00b4556f90fc78a74ecb520c522b36d1151c72d84fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which are hosted on WordPress installations using the 'formcraft' plugin. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest this PDF acts as a lure, directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=happy+marriage+marriage+anniversary PDF link annotation
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bac4953b4---sofewubikibutoga.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7e404820---37612668534.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/25513304916.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/29655466761.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/56574295409.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/49869cc67a2f3bc313341f0b8bce593e/58038795936.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/70565991781.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/faxigenizafega.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbd4cf132---jawosex.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/60fd04f2e5b63642aee4d014295aafa3/rajatupujababudix.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8cb741b8c4f9f4b6e82e59786ff5d668/vabibezunawe.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04f7d663c---33226228789.pdfIn PDF document text
    • https://etimes.mn/uploads/files/betenadofojavukarelakox.pdfIn PDF document text
    • http://kpnamboodiris.com/userfiles/file/15291558580.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/18d881f296db3f1668dda3629c8c3732/kopawu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/89733365201.pdfIn PDF document text
    • http://bdn10.cz/files/file/vebufupitobavirefufagu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6d121aeb9eb584e0d915df6f8f29116e/2834942211.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7u7iqhljrk5ilfam8vk69kt0us/vekujobapafopagolojiru.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/risudavirobudaz.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5993e20a57ad6f30d31c9c12a99e6215/kejisemew.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/29889556548.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/76522102594.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/16374391664.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 18188 bytes
SHA-256: ce89afbdd24054858465b9475f46c38bfd01266d896954055e3474a3746127fd
font_01_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 10504 bytes
SHA-256: 93663a867ea7e18145acfb9ae028fe2eb94f5cd3c72cee0555d4e069e0369783
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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