Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8dc8809b030bfd…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 13:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b08de0e0c8e4f50c7615e44f309bee0 SHA-1: cebd771f8d6ab1b390be5c271ee13b22bfd760be SHA-256: 9f8dc8809b030bfdb2c83f8b8b789b34b60c7fbba29b00c8613b7d07edb5ce0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm designed to obscure the final destination, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://samsungklimamodelleri.com/upload/ckfinder/files/26686998296.pdf In PDF document text
    • http://citescolairedeledit.com/include/file/nopaz.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/vikiz.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/bafejikerivulige.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ed3a9813b351b5694f4ca94689ed218c/goxazexirazuxumefik.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/44580891345.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613959564343b---vopijitulovawoviweled.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/fazipamajoxotinajosagete.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/52053880489.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/37139862925.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/58046313121.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375950eddf3---42971125843.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090512114313.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/26949526213.pdfIn PDF document text
    • http://skisun.it/userfiles/files/91614998163.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/31386552169.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/tusamumupor.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/jafuwasegarikufu.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/mifabax.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/vevivagewitufaket.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/59814791673.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/febanebutamovog.pdfIn PDF document text
    • http://isvpro.com/custom/files/kixunuduxokodatakox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=verizon+ringback+tones+for+androidPDF 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_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 10868 bytes
SHA-256: 4e2c8bc549710cdcee82a7c69d01db3e7f8e997179d01e0c905eef1be6dd26df
font_02_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 17492 bytes
SHA-256: 073221db8dbbf90eb13358bfd47dba3e6b6f50e89d2b148b0c0d040f3bafcdad

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