Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0d213c2d00e4c5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-10 13:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2140f502c94265732ad502ab619e577 SHA-1: afa52dfcde10ca88dee356202434f2f4253beae9 SHA-256: 4d0d213c2d00e4c5f7f4d97c459ae3cd00070fd56f6c5846a3b114b45b36f46d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5372

Heuristics 5

  • 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
  • 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://progfin.pl/userfiles/file/46762149212.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///76355080770.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/58047451687.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/sanebi.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/86501308555.pdfIn PDF document text
    • http://detectiveoffice.net/userfiles/file/lenabumopubazonefujakuv.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/54224582168.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/25288127137.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d276b9cb---14014136517.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/ruzefuxemunenutipumawa.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/25295265024.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/15025804996.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5da2i1hc1g9prqn3drab9nhvva/kawude.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/43646317965.pdfIn PDF document text
    • http://keacg.com/upload/files/nudajexumukezivaditije.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/11277784044.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c82db5e0---27902425716.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/95307377219.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/40084197296.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/84644277300.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/tovipizodikogo.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/60921640014.pdfIn PDF document text
    • https://priscar.com/documents/files/99897949344.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/99263112566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+secret+conversation+on+messenger+worksPDF link annotation
    • 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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 17652 bytes
SHA-256: 218a37fb64fa5cefaf2eee4b2c864987e50d12fe132827fc7267c7633f3bab56
font_01_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 10760 bytes
SHA-256: a8a65004bdfb67a1b22f5ee79a7961a3318f7abe7d16ce671275d79107a9918f
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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