Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d487bdfb4b6ce8b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 00:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 853928998f0469a2c814445162ebc74d SHA-1: ed4dff0776ed4024c73c21645dd743ab8967dbc4 SHA-256: 8d487bdfb4b6ce8bd7598442b5be0e42b5fbd793fb5f362f141902f73708798a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://infrive.ru/uplcv?utm_term=accidentally+deleted+mail+on+iphone PDF link annotation
    • http://mansiya.com/uploadfile/files/tamaresabapomobuget.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135407541a5c---42005344647.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/mofam.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/mekuxatinebodamamanugipez.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b060f65ea2---lovuroropiviwebilekevej.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/72670705715.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/29974648076.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/labetokuxizanibimut.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/todilazaxalasexelejuwa.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/dusupakatijabowukidowi.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/31197274584.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sixapemilavutuv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d251aa9814---wuwinija.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/45004730307.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/58682442565.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70795752061.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/odfgnar3dpvmv0lmolr7gv4n90/jomubusuvidegumuluwo.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/kovopoveza.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/ruwunuronipamolima.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/xajizipopimefavu.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84167223250.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb726bd55---nuvapaxotufon.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/kepofafireketuvuniziluxal.pdfIn PDF document text
    • https://sadex.pl/fck/file/94806498745.pdfIn PDF document text
    • 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_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10608 bytes
SHA-256: 94f5a528119aada89c3863431f3b1b7791a89294e89e3921f046453425bcecfb
font_01_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 17700 bytes
SHA-256: 2e07c3ceda18bff409712af7059e2a0801f1c576ab205e5ef112d6783f6e905e
font_02_sfnt_off00012f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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