Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5c86586aca1f4d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 18:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fef025b09b96b5414e10c73f516a3096 SHA-1: 832d4f74eb8cf9524b050c8367f1290953fb8e08 SHA-256: fa5c86586aca1f4d16fe4f8c3260e8ad9300e1f2229ecb18be2dd6ecad4f9047
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure as a link farm suggests it's part of a larger campaign to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b00d3e773---vijilelikamida.pdf In PDF document text
    • http://bociany.sk/media/file/32584224466.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/lemowig.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609410ba0e069---3909415947.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d7d288dff---bopaz.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/rigalovabolofu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ad14b2aef---vanifipegaluwori.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/popekuxisosiwi.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/bepenafelate.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/jufexizi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/garasupitibavefusejomi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tasagojekamatubadi.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/42169734763.pdfIn PDF document text
    • https://grnca.org/img/files/files/4515844740.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a5dcd3ca5590ec7c2683cc312d218917/67430436741.pdfIn PDF document text
    • https://digireg.nz/upload/51239025607.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/mujekugazukezivotaxekexof.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/93982150025.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/fudavasobekitokejeneja.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/defuk.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/miwipepapozaxojegexutixul.pdfIn PDF document text
    • https://kawanmto.com/contents//files/49711360707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=access+control+system+tutorial+pdfPDF 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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 16824 bytes
SHA-256: 82ca79dbef2ce09616251db310024543ccc3144890ed30d0e952d9e3d64b7ec3
font_01_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 10976 bytes
SHA-256: 8577390f7f10617c2fdebe5809cdc6695512d2ffeabd89750d37d945d41c0a55
font_02_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1