Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e520e2cda907982…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 14:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d961b211676511dff9afc0da9c47278b SHA-1: 293a2dafe39d30eac99ea51af2e476e007c6c2c8 SHA-256: 5e520e2cda907982cc6548b5a8e30f048ac1ca7fd40076bdeb98bf72c0435f17
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it's a link farm and a social engineering lure to install browser extensions or updates. While no scripts were directly extracted, the nature of the lures and the detection suggest it likely leads to a malicious payload download or credential harvesting. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://vargyasnekonyveles.hu/kepek/other/file/rapusigigobosasa.pdf In PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210904132920.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/nagovejabowokopid.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/nebelinov.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/tegekiz.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/korowukikexuwiwururod.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/gafinupa.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/nudakanibisivosi.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/44137284561.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/fasob.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/tezodez.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/nowewotigigolaselovevexo.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/taxunoxigajomavevi.pdfIn PDF document text
    • https://kildevangen.dk/files/lelarikeliwitixesokoruf.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a676b1227---muropunazugelu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6792c22a---51336989991.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/bewixumolagadofupelefofip.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f183dd3a8---60196684523.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/xotapijedonipekorekel.pdfIn PDF document text
    • https://sealskinz.ru/files/file/63660428757.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kukutiwe.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/sasifilasafimoj.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/pisip.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/bopapefonoroxugogixaleko.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/xuriwupetunapinosisuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chrome+dark+mode+on+desktopPDF 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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 10640 bytes
SHA-256: 4d1af877fcf786f1f10c1f930efbc23fff514f5302c21f63c1e44a6fcdfc9811
font_01_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 20248 bytes
SHA-256: 7a8d5bcfe3c11112eed9896d351db3d2a1ca68e4e97cfdb58f4e74081ea74112

Open this report in the interactive analyzer, or submit your own file for analysis.