Malicious PDF — malware analysis report

Static analysis result for SHA-256 32baf8240cdc533a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 20:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e444d9c13e7e00ad69e990a5cbb1627e SHA-1: 04101476d13667cd251392d9d3a89fedddd54ca0 SHA-256: 32baf8240cdc533ac21e3395370020d2a092a78317566d65ff194cc48076425d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through the linked sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ohdiabo.net/images/ckeditor/files/xavatamiza.pdf In PDF document text
    • http://taxfreepoint.com/file/50597627284.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/kupukaluzumatox.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/roxifugexaperitomisene.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/67567393089.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/sunonane.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/77718014031.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/nixevudevosibudanuzelemux.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/xanema.pdfIn PDF document text
    • https://mklaassen.nl/images/file/11262463867.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/43510072363.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/12023597520.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/kizexasexudakow.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/80711795105.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/mujojeluwukolatof.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/susuzovevedolad.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/sibimoxakomejufu.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/jibibuzogebifawazemugon.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f5fd9c0b295bd52ec2113646f4ad4ed9/mawojip.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c84e8d30---pofinozelum.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/jobojizinupu.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/putepelekogudobonotu.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/94270110538.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/rotesexulo.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/70829708626.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613595e28bb4e---50417676566.pdfIn PDF document text
    • https://labelmarket.eu/data/file/sakedumefotuxome.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/kubotomilegow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=antenna+theory+and+design+stutzman+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23E 16556 bytes
SHA-256: 2d22e96c50eaf6fbf502f8e125877eda13fce12eedb6f74ab87af1348f6d21cf
font_01_sfnt_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 11156 bytes
SHA-256: 46e7a69a8e100ba1a45006237171befcae5c4f91eef8e04797b349c553928119
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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