Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a55b7448570bc5…

MALICIOUS

PDF

89.6 KB Created: 2021-08-11 07:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9851bd5baf1ec73d10a5ab4e78c810c6 SHA-1: a70f6a8435f9ba26dbd29c7906c931aeee11a880 SHA-256: 75a55b7448570bc56e7eb362331999c24e23c4395228e1f059900db99a3b2555
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://avtrak.ru/ckfinder/userfiles/files/48119060004.pdf
    • http://fitviewer.biz/files/file/bidok.pdf
    • https://bouveau-consulting.com/userfiles/file/pezasejifokinemulabuvema.pdf
    • http://sciattella.net/images/file/pekenavazimuvivapevowag.pdf
    • https://akvaguru.hu/user/file/purofuvorob.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d5c840f8---sevaxeruginipiwuz.pdf
    • http://dvif.fr/userfiles/file/vofuxepoloraretutu.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fff43d73f---32926708890.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/28b6cf067475785f247ad53ca3ed5f6d/gigatipowalewuw.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ecf2db719---38979600335.pdf
    • http://hublihorse.com/uploads/userfiles/files/xufidotemebuluz.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/noralor.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/76a02f41e49b38aa71c1f6ecb0288448/zorovovewibaruzotokat.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8pautp3lefq44flr2n97bgd96m/40311215994.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/9535819996.pdf
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/51010764259.pdf
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/56084416747.pdf
    • http://nadiadsa.org/userfiles/file/morubu.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/652c2d99128e80813a1bfd4c087c4693/41875110849.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d561e3cd---70440738170.pdf
    • http://sarljarry.fr/userfiles/file/togirijawoxudamija.pdf
    • http://phongkhamthienhoa.vn/images/files/kuwimiterilavagor.pdf
    • http://dietgame.net/admin/fckeditor/data/file/20210810015305.pdf
    • http://voszveszprem.hu/_user/file/waburepob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bose+soundlink+3+update+software
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
font_01_sfnt_off00010e76.bin
edaa20bd1edb58b02471536c869d7fb26c20a007cbf5e8b5c38817cd685e1e79
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 10992 bytes
font_02_sfnt_off0001283f.bin
168ed116d614dbd59f6ddc14aab8b1bb93b4dab8202045b241f1c9fecf2994cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 18108 bytes