Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e3f098fdca26e8…

MALICIOUS

PDF

94.0 KB Created: 2021-09-06 17:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69d9781b1ea714d9a5f60999cbeb3f09 SHA-1: f58a4260468256a77db0ed0356d085832eba60e1 SHA-256: 97e3f098fdca26e875d0373981a99f7902212f0b336f31829f76288d310042e7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://koreaseals.com/ckfinder/userfiles/files/88485819553.pdf In PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106301759484999.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077641e1c358---pogibepitimanumotemusulu.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/29218299439.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210723235057.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/63566757471.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/zuxomuwewuz.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4a83bb62---41775433693.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/73454399467.pdfIn PDF document text
    • https://emenu.hu/editor_up/32065277008.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160954f57c03ca---6503301073.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/nuguruxopobenimifon.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/77287937103.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/zelisibuvuxiwi.pdfIn PDF document text
    • http://fluorescent-training.com/file/xekowigumufisivuzugilovu.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/medixe.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7ea16e66a0fea8c1879e445694ef3311/70604960934.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b02ac636---napamitalamid.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1acd54e2fb7bad8ed20f7b97237f2a9e/22495482353.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/098875e23636e9047f038946473146b0/45257160150.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16125f925991d0---89421051637.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/68062514636.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1cgs3e6ucpu15s4rtdd4m045ll/25333301352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=descargar+libro+inteligencia+artificial+pdfPDF 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_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 10936 bytes
SHA-256: 94339ced3b94695478f76fba54687ea0fd6bda0f641c129e0632794edc9eeb70
font_02_sfnt_off000136c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 20392 bytes
SHA-256: fa54818b8e4b8de9ce012ac720a6b94e8d9be5d782a521eea5754dd82e9620f4

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