Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b74ccf49ab178e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-01 10:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4824ffa5b93c0bf0ea6d4f2f369af6f2 SHA-1: 738aa4fa1ed8d1565fb6360171e4621b1682a0f5 SHA-256: c6b74ccf49ab178eefa924a88d214c57a2c8c126f40597fcb29e425faf750d9d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or redirect users to phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c899a8a9fcf---30550091680.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087954f46d0a---gonanumegig.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/beviwazamazelodadobetemaf.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c845e03f4e---darufevuf.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/2389168838.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/46369743749.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0efe496b63---jozirojuposasolon.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/nusapugowilititaluvog.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/20574698270.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16089a116c522b---fonir.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/bogalixuxi.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/repisukevilegesez.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/84480066532.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/99531619459.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/86852544669.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dcf5288c3---90791507550.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/muvelumowit.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1771a502a5b93520e179ad84b43fc8cb/92234310894.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2eb77b8645fa003c0966e311d994c96e/27440283738.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ruccc5ce8cvk49g35cteb7cvc7/nafivajubujazekotogumu.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/33394366042.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/vekigewire.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/64880159068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+meat+for+weight+lossPDF 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_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 10696 bytes
SHA-256: 5d0353af8c87b8a06a267bf1044ce939f290d62823c522d03a85839ca7434a9e
font_01_sfnt_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 16252 bytes
SHA-256: 14378ca3082a64d2750da80f148a946e4e057deebe3691e52ac9084676237ef2

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