Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae37719adf1f9dd…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 20:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3f88d4d11137c1ca2fed07d0dda4088 SHA-1: 80d76895bebefb6b2b5f1cb4395edb4075b3d9fa SHA-256: 3ae37719adf1f9dd792d78d0ea3ba35585832e4ab9fa96cf1b180e853b79000c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ourcampuswindow.com/ckfinder/userfiles/files/64674558372.pdf In PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/5ee9fb68893e5e1a18e71b3e280eb014/demezovenimev.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c9872aafa7b3dcf3350b99906d68bb3/nekelata.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/lolilopaximagaxunasug.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b33945b7a6---41634550246.pdfPDF link annotation
    • https://cakenflowersonline.com/userfiles/file/poxat.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160782a2a16d5b---fusezozujadajiwudaf.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/32568368991.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a79b9c982b6---litoligikam.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/musifuruvipun.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210815165714.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f222a8d70e.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/5058311062.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/fuxawebozadakevelezizigej.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/zaruzono.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/850a61a781a3dce0f11510f62bf0d441/musib.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/mitawafobefiwifo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a6586262f---rofifanuzodirowix.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d8ce9055---rubemozomewo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168694a53f---84891756489.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/brrkqh3a24lmgpkft6s3rudrcp/vunegigobotiguwumikixaku.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2deda693287d164601965cf49d62e615/38055093317.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/fezusikebolixekovaki.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/57d4a062a2a94978827479542fbcae88/96245812593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=two+digit+times+two+digit+multiplication+worksheetPDF 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_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 11200 bytes
SHA-256: b3104cd8a667006f97cf8d526d38014b1bf93f34a1c361edf7ecdedf9df6a8bc
font_01_sfnt_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 18396 bytes
SHA-256: 67e70fa64eb1421b1f34fa0fa3037bd4e61a52a23d23785438ff6fa5f8473450
font_02_sfnt_off00014872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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