Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3b3b9f3d1dd69e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 02:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6baa9aa08cd741b9178c5f7d9b32979 SHA-1: 384de3e6a1a3c2a3d7a04c9f80e8750379ea2db4 SHA-256: 4e3b3b9f3d1dd69eed5b5b139d369c56c90d74ec201e348ba5ea0a27a30c978a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The file contains numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=vice+city+cheats+for+mobile PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d803292775cf0189ab0a3fd1776d72ea/tusadi.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/78718009763.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/576275519.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f2e15c2324d9a5413d239ff48c6aacb1/33612942320.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/mojajarafukuruxiroru.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/11273003489.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415a46e8954---xarovesimasowuresesogaluj.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1554840107613e58491ffae.pdfIn PDF document text
    • http://med-os.com/user_upload/file/62224415257.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/52387004638.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/84522470372.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/rasozajero.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/75130547872.pdfIn PDF document text
    • http://aurora-c.jp/files/files/12237166798.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/litevaxot.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/suximozajopoki.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/wukoramu.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/gewadixijewuligojidid.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/5242348730.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/46542157265.pdfIn PDF document text
    • https://aneri12.eu/res/file/baxivafavo.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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 10720 bytes
SHA-256: a9e00d3b25197fa3e730edcd1fb9f5f2b83698908092447ed2dc3fabb1d64f6a
font_01_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 17644 bytes
SHA-256: b923928bdff048f466ffece7a839034c77f947ef209a8b38d5accff0c0f573be

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