Malicious PDF — malware analysis report

Static analysis result for SHA-256 281901ed22733bab…

MALICIOUS

PDF

66.2 KB Created: 2021-09-14 14:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88f365a4823fc1873f23cc1289009323 SHA-1: db018bbed30ca56b0eb0b557f54658e673e92e0a SHA-256: 281901ed22733babf553be7a17818b4413fa4baa955fee6bfa9bc3dc05e174f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing malware. Heuristics indicate these links point to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6405

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://archism.ru/uplcv?utm_term=focus+keeper+android PDF link annotation
    • http://dadesigning.com/daduserfiles/files/72287921467.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/07/livofevezusutejebuxusewuv.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rifewudivozuzawa.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/jufufa.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/zoravotigubarudutevaka.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/8391538408.pdfIn PDF document text
    • https://italvaping.com/file/domubozosoxefinoguga.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/voladok.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/wekapitiwelotegani.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f7e1db3d---nerijupetazudolasujavaj.pdfIn PDF document text
    • http://minerva-collection.net/files/files/37334181616.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/zikatubogukavikofexobukim.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130278b4f087---81796234044.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/98805248218.pdfIn PDF document text
    • http://hydrem.ru/images/file/jareveromovevow.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6f79ea7d4---77906396461.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/90069886223.pdfIn PDF document text
    • http://mextro.de/upload/files/likepa.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/tilonelemuboviva.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/zinapupelu.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/rigiki.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/zesojututomekefovusizip.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/70246930798.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b480bca7caa07e8186d8807e9c089287/nimuladelazolatamapajo.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/buziwepufotikasozaboxilil.pdfIn PDF document text

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