Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dd99e840fa1b55…

MALICIOUS

PDF

62.3 KB Created: 2021-09-15 17:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4b13d8892c6cbd27f73f9d60174aaaa SHA-1: 733ef4240a94819ae536875558a5b237c5b3a433 SHA-256: f3dd99e840fa1b55178b150f3bc461e15136a5eb1751b86c9d37615b45c4f88d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards a common technique for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=mcpe+for+free+2021 PDF link annotation
    • http://suliaok.com/v15/Upload/file/2021911524245352.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210908_045631.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/82778906513.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/gexedizopizi.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/towexozagafejov.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/43743158253.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908022531.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/sukozulin.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161303f1027383---54743984691.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/97340955334.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0nmb5g3fg3dufv496rrps76iok/49081457602.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109051604209073.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210911010756822.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/8865788313.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/2243716179.pdfIn PDF document text
    • http://belovosushi.ru/files/lafixuwiduvab.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8d91cc88be6c60366da7a9dfd862493a/19477662257.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/kojokifami.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/51264370802.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/fekipojosoworasujoma.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210909140943_1371713047.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc25c9e7f---goxemebunetunomekamesexuw.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/50757777588.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/sajat.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/gajax.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 10092 bytes
SHA-256: 66144f62354cc87b66003d9535a98bdba5881c692bc084011ec028a6e67dc2d4

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