Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67a87090520737f…

MALICIOUS

PDF

58.1 KB Created: 2021-09-24 10:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5900c3fab468c860f77a6a301c785008 SHA-1: c3dde96acd4bc4d5e69b60337c79fedbb753d524 SHA-256: e67a87090520737febcb7faf5778f83c7ada4fc83f8a31b546da83442d0ac825
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing numerous links to external resources, many of which point to compromised WordPress upload directories or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a campaign to distribute further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6236

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oio.cn/uploadfiles/files/keterezanazo.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0bf94584e770c77f2523f17bfff0b96d/bumawujiranobagelisegem.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/74720778877.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/bunapawuvorugivejafexinop.pdfIn PDF document text
    • https://blugarden.eu/file/46331382932.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/zerosekejam.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2d4535fc0a80d04371b0322af9e6432d/noxavowilobatopegub.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/xakedejugixurubogasi.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/jewukubujaromiratopusu.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/27850124009.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/satajimux.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/86ae87b01e675603abec897504f7a954/sururopuwopoda.pdfIn PDF document text
    • https://adikmanis.com/contents/files/jujuvuja.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/jexawubetetaxapexokakukuv.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/xikarejusabetezixuwonet.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/84584097863.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/16881076377.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/rofolepetunonovezefojipi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/bekativoziwidogojefa.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/zeketokefuxewiletisa.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/13494206340.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/xipikegatat.pdfIn PDF document text
    • https://invest.pl/userfiles/file/bimud.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161491f5646723---wufamizo.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/turufafulapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tv+live+apk+free+downloadPDF link annotation

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