Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b67566c710d5f5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 12:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5481986a8a16be0841854b86258e588 SHA-1: 91fc9c67acc9ca79f731efd726b37de6a7b98cbb SHA-256: 52b67566c710d5f56cae29c457b8279c0ba8fc3c210965f9658a3fd241281996
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://inwebjor.ru/uplcv?utm_term=parthesh+thakkar+ielts+writing+book+pdf PDF link annotation
    • https://cuacuonbentre.com/upload/files/10486743266.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16147695c3cee7---35072928997.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210920_082004.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f6bb193b2---25232402395.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/63706602999.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/suvisuwubikato.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/22556943338.pdfIn PDF document text
    • http://spiregene.com/image/files/20210923_060340.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fenuziwerivuf.pdfIn PDF document text
    • http://hibertek.com/image/files/20210918_002557.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210917073839.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/zefopofiwepokavenedej.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/97308907792.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/99106261209.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/81728223228.pdfIn PDF document text
    • http://dgjst.com/upfile/file/daperuza.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/47203379498.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/94385328463.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/doseledokonolevinazawi.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/31322028304.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/wuvatuditezunoradifedug.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/pinutimawufugolel.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/38093744145.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/jedisuba.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/43971493586.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174a0a8af6---fuxebovemeresoxugegavod.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_off0000b309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB309 11096 bytes
SHA-256: cb16cadf8f6464ed8421a6e9fcb2a3869aa45aff44b26bd9dd88c012eb13046d
font_01_sfnt_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 15276 bytes
SHA-256: f97bc9e5dc6ce2be10a665c35b448d23d6163ebe5297c8bea894e5ad19df3486
font_02_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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