Malicious PDF — malware analysis report

Static analysis result for SHA-256 df42f0f744fa6c8f…

MALICIOUS

PDF

62.3 KB Created: 2021-09-21 21:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f0f82cf4856eef5cb19c53df526c529c SHA-1: e47812f502e2071b501dc1b6cb9e09cbc8ad5e94 SHA-256: df42f0f744fa6c8f312ab1274d628cd84f6c46b2a034a8ccb3919eb6297d784f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9620

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://infrive.ru/uplcv?utm_term=rich+dad+poor+dad+ebook+download PDF link annotation
    • http://barcelonasixtytwo.com/userfiles/file/44451066089.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613f76d27e2fa---71829609847.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/65860755189.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/82d475b36958c9152c89ec027d5d8283/xonisibelugofir.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/rikigu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4igs190n1fnj5n2o7blva4809e/medizaxixokosubu.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/rixuraz.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/turuximiripuxirapunere.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/sewurudej.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/83081451106.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/saxajamixiwese.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/85382400329.pdfIn PDF document text
    • http://klpa.net/userData/board/file/tivodoz.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16148899e40bb9---mugajuvebaxig.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kerizuwejozozovoxigokad.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/95484812639.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3c4c4e8b6b8825ced8459b207c77d2d7/8002050286.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zumupafomewigot.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sulatazewibo.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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 10708 bytes
SHA-256: 093a34664cfeff01915241005b7a950334ac9a72528bc625111871445e4235c4

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