Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82d7df5b9e3be22…

MALICIOUS

PDF

63.8 KB Created: 2021-09-06 00:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c2b16a1345f1d9a80b9e01ff7ff1df8 SHA-1: 4b17d63ee9fa43aab851a4c50cfb7c453eba275c SHA-256: f82d7df5b9e3be229024ff7a214cf40ea048cab248b1d1d07d9120acd342c469
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are then used to host further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://villadorottya.hu/uploads/frontend/files/61581118405.pdf In PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/5656269897.pdfIn PDF document text
    • http://fygl.net/uploads/file/150833143214.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210731_BA1107AB69D8A91E.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3e2973c98d10729596ed024d69f711e5/judipibupipajaxakajobizez.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/paxefefinosuzad.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/fezog.pdfIn PDF document text
    • http://ametansk.ru/uploads2/30939756182.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/dofodujitezejujotepimago.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/99846043687.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29041826537.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/973597378.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ca3ca3b36---giguxalafewax.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/81088242251.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a004a7a189b878efa5da04425d4cd745/talotuzafimetajaxojuxex.pdfIn PDF document text
    • http://khmer24biz.com/public_image/alluserimages/files/gufizozakolojakejup.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/dibobidokimirozuta.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/tuguva.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zejokixakolug.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/wewaxoxefulew.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/sevizomigerikok.pdfIn PDF document text
    • https://starbox.fr/img/files/zumenipofefavezilujekun.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/gipexoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=les+glandes+endocrines+et+leurs+hormones+pdfPDF link annotation
    • 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_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 11124 bytes
SHA-256: 1731f68e265d144594c574bd61b40b4b67871194e30f37cfa583a1a355bb96e2

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