Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cc6b46e20dea0d…

MALICIOUS

PDF

88.0 KB Created: 2021-08-06 20:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e8d3b21de5b0161e6508b326cd44b664 SHA-1: 6c6407ef1898b7ece92726ec6ca8aa45246c64d4 SHA-256: c9cc6b46e20dea0d8b15d1f4aba5c1a20e267bea51824bf5fa609e8295905447
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medicentrumnz.eu/medicentrum/files/file/velufukejejilowipira.pdf In PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab71f28c7---16868722054.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/6c325d0ba660ddcd4d7a3ebefd1b3459/10627545987.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161009654afe30---vidutelujeze.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe86176bf---12652774236.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/0a6db06d7b95d083cdc08589c2dfbe6c/73255382843.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/fb5980267f169e5ec5e2db6b055e77a5/5556067017.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062504033470554.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c2664a2882f---jovimovak.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/nitetewagodekegomolof.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160813867ba80d---potalovobameduwuk.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/nidizabuzudogipukoxiso.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/ladutogunekof.pdfIn PDF document text
    • http://newo.ru/files/files/mafiwibisipalitakenoweb.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gl1ibtje4t6jitdv7ud4gp8l01/lonimamamesesafevo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be7aed48705---fiwufilife.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/55512616127.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bf69c6e1f35c6be504348b38fa749d20/7345620822.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cfd92bda579380abd8e1c21ea23e0429/36752358388.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/dfc5c67bafe791b0771ec3276a13429d/39566908513.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5c262d59---fobitorujenovonefijobusud.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/rixam.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e9813f0c0c90cfadbccfdfc878fd0d96/fifafujabuxapugixober.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/24818355769.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/losedarovopusodekanowow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ar%C4%B1+yay%C4%B1nlar%C4%B1+z+kitap+k%C3%BCt%C3%BCphane+indirPDF 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_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 19704 bytes
SHA-256: 4d7d52e67b78e0ea8b510aaad452004df90c19f3308ddb8b12728abab66660ec
font_01_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 10688 bytes
SHA-256: 79147694f4b0cf9688adb1514bed7a75e61c4c6e714549cff0b32a1b8379a910
font_02_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1