Malicious PDF — malware analysis report

Static analysis result for SHA-256 df67f753efeea737…

MALICIOUS

PDF

63.7 KB Created: 2021-09-16 07:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2bc83a4f7b7f1d5ac1a02cc45e16e357 SHA-1: 809ef5da163fe16cfdae2380a4768f8073ff81d3 SHA-256: df67f753efeea737615c60cf4f9b66e5bfe6050d4f20e0e9bfde9a9945b79307
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a common tactic for distributing malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9161

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://laborke.ru/uplcv?utm_term=harry+potter+first+book+pdf+download PDF link annotation
    • https://bisnismedsos.com/userfiles/file/82003242292.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/32165332154.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210904_9101A90199E370CB.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/52052749213.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/12930337222.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/35673581547.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/noleporebisas.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/niruvudivugem.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210902100750_1685255503.pdfIn PDF document text
    • https://rosycaffe.com/file/kimeruvuso.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/66297755712.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/fokemokigekite.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/padukoked.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/mapukemobubutogegos.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/jolokitopofuvet.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d411f29a8a---gerejokobi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1993149a---dufeb.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/99552903050.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/zanelovazolabizosutite.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/kuvokawexiv.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/livodogugorowixib.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424b81415cb---57424898455.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/80278345308.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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 18344 bytes
SHA-256: 40f6e865bf8ceb650884f315778ed3f01370bd5127b1f2e8220800b9be4eca57

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