Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f347b6b4bd6466d…

MALICIOUS

PDF

95.7 KB Created: 2021-09-03 19:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82ff3d063d53bcf27f66696f4f28c746 SHA-1: 2021e96a7f4d92ffe20132719a3b1fd99d31caea SHA-256: 3f347b6b4bd6466d55f96d6eb8e8fc4067340eaaf74a0da6aceaa161eef516a4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it is designed to exploit PDF vulnerabilities or trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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 http://lsneotek.com/ckupload/files/nalefabafinonumedatoki.pdf In PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/fobusimiliwe.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/jokasimabesaluneximoz.pdfPDF link annotation
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e7630c1de---defaselosegu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b683714e649---36522294020.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/59425358301.pdfIn PDF document text
    • http://airmon.hu/images/files/36055864547.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/35263422325.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/86432652199.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/29176570964.pdfIn PDF document text
    • http://temple.mo/userfiles/file/netanajomimibeluvugogal.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/16/files/nebugodapazij.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/63837153906.pdfIn PDF document text
    • https://ikansambel.com/contents//files/mozinatiwi.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/ragafim.pdfIn PDF document text
    • https://lorus.rs/files/bofagobemavomoduja.pdfIn PDF document text
    • https://bamor.org/userfiles/file/rusidagugopedabevix.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/8871935575.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50d47c12f---jikusabozejutawosatisu.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75796146618.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610d38a06239f---wevivivavaz.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/64400494450.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/24295973012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=akracing+gamingstol+manualPDF 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_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 19308 bytes
SHA-256: f5b56600fd0e7bbb450fa8b51c20c66c136e46a25ba6ca3b6ea325dad0c4dee8
font_01_sfnt_off000140ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EE 10616 bytes
SHA-256: de8a259b2859f15527fb4a0fc127363818474eaeeda559dccaaa34d45b5226b1
font_02_sfnt_off0001593f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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