Malicious PDF — malware analysis report

Static analysis result for SHA-256 870723d80732f3a7…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 03:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9e1c15358c24d8ce49870c552984e5b SHA-1: 6f8fb733a9f498ece48910608ddc98461f12a6c0 SHA-256: 870723d80732f3a78927bf0bf320875eb3212e93287269022d8a56d0dd3ecea9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to potentially compromised CMS upload storage, suggesting it is part of a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7671

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 https://garglob.ru/uplcv?utm_term=redmine+android+app PDF link annotation
    • http://www.zywawiara.pl/pliki/69011708920.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/rebebepokonafiro.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/42141123279.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/derugutowokalekakamare.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a915a204d4---29798549304.pdfIn PDF document text
    • https://conrays.ru/f/data/91097562908.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142781aa0761---gesosuzobigajatetev.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/veboguwud.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376945d9f73---67763751239.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/15758271955.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/73784392310.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/zedamoriwozibirabatude.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/2084425843613c36d38567a.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vabazatomot.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/53778381232.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/wuxofuxixadutagimusezazil.pdfIn PDF document text
    • https://eetravel.net/file/32634236084.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4c3e8e6f---zalekulagudikoxuki.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/rixafobadatewaseseba.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/jevopuxobovupesarobunamam.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/pofalakijekowujusivibo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 10288 bytes
SHA-256: 281250b30299078fce438fea709c038d7dd8296ee50b1bfd9957054460540748
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 18056 bytes
SHA-256: c581e8146d8a20e5f3078f286b0cfe0e2fe3352b2c8e6a379fed997f545a01e0

Open this report in the interactive analyzer, or submit your own file for analysis.