Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa25c010ce973a0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 18:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e2bb81c4abb0cd78e0516cdcf418dc2 SHA-1: 452d1a8eba937845eed762c48b1bb008c0ba41ab SHA-256: 7fa25c010ce973a0bd5911e62be6250576a18624199a60bd6571b0bc6891b98a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4203

Heuristics 6

  • 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.
  • 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 http://wieswioska.pl/userfiles/file/37782550239.pdf In PDF document text
    • http://ky-auto.com/uploadfile/files/74629906125.pdfIn PDF document text
    • http://asja.ua/userfiles/file/xepaxazakadivolalulijewa.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/12868476793.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/pagobubifokigepagenox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f47114f2---23261616762.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/30519596475.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/wiviruzojolozub.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336d5e081c4---94553624437.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fc9d6906f87d9848fb330f15b2038a88/26584198294.pdfIn PDF document text
    • http://allycatering.com/userfiles/47732930164.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/gozavunexaju.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/10454677836.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/mafidijalo.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/46855662835.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/turajinoxesaz.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/19635385590.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/lodabizid.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/zatumoxikizovof.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/lufigudid.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202191638221753.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/8090857374.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/fulexigubazewewadelix.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/malodujoduzazabamepenej.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/badexolajetozu.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/nugerubuvudakubafuk.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ff1588e6---rabuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+check+android+version+in+miPDF 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_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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