Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98d2c70b5e85455…

MALICIOUS

PDF

64.0 KB Created: 2021-09-03 01:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3024f1e78d280fa7a957c6c480001918 SHA-1: 7209d52fb3c393151cf0bc1ffcfb5a4e3837d0ef SHA-256: f98d2c70b5e8545598986b8185bb860d5983fe3d6c41b8d61d30306881aab340
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that functions as a link farm, directing users to multiple external websites. Several heuristics indicate the presence of a link farm on disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the document's structure and URL patterns are indicative of an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6468

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://esejsc.com/upload/files/baregifaketemosan.pdf In PDF document text
    • http://udemadriatic.com/userfiles/files/polijaro.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef8039767---lezosugu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609451ec3a60b---pebidekixesemafuzizixa.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079df202d4a8---jemak.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/671fbf682f5d7e23ccac1bfd49624c7b/12588606657.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb5b6c7fe---13656735463.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/jolavova.pdfIn PDF document text
    • https://tekartltd.com/upload/files/roxotasujixuvapimizabusus.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf26207fc5c---gedivudividiximebamofa.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/najusiferovofogigaz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd32f87cc9---vatenuxa.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/gapuxigijijogurinoxele.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f8a99741e9bc9ee474352590105eb7af/dupako.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985c670fd09---75473116690.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/37901432575.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/ropekaf.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/46e2a46362e3f296007ac83941c7a519/vexogegoropor.pdfIn PDF document text
    • http://fotomil.pl/ckfinder/userfiles/files/tesenevitovota.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/71635871476.pdfIn PDF document text
    • http://qdcmd.com/data/files/topetopumumepig.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/fisogapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=math+problems+and+solutions+pdfPDF link annotation

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