Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce52334a356af3d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 02:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8c38203befbb157887ebe79ddee484e SHA-1: fff8859a023b1c39fc483edd89f8b65821bdcd27 SHA-256: 1ce52334a356af3de4d58c5f4811b956b257a7292228c8a149397450e1f5075a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to disposable hosting or compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself is not inherently malicious but serves as a vessel for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://badeluxe.com/userfiles/files/83519874460.pdf In PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/69051298675.pdfIn PDF document text
    • http://zubrcup.by/files/files/kepulafumitafimetixej.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/8990865657.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/53600317477.pdfIn PDF document text
    • https://kaparatt.com/images/File/daxozonefop.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/mifogimezak.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/nedebamozagebuba.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/61737497714.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/85056103886.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/17534954370.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tebakonapowon.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/90771024446.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3335088b---82798227812.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99bf2c916---22463790256.pdfIn PDF document text
    • https://intersat.lv/files/file/79652082573.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/sexinajunewasuvozox.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/fuxuv.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/wapoxe.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/busixeregakapezinawixele.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109060013213414.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b570c8775710c0d35b4dc64aea6e5f2f/nemekikabowerikug.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobijusuw.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/t6qh9fpqqpnigof3v2j91dt533/woladerev.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/45121416364.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/15849853873.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/575e9e0ce64fd4e894c9efd1046e15b7/38279015709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=plusnet+email+address+formatPDF 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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10616 bytes
SHA-256: 675dacde1d8d942dee536dedc6460c08e4231b6a383843704fcb1b4ebe9838ad
font_01_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 17572 bytes
SHA-256: 3dbf1624caf7fc60d14df474de400571ecae4c441478edf7df80aed2bc48b76f
font_02_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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