Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a157d2e564c979…

MALICIOUS

PDF

67.7 KB Created: 2021-09-17 14:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8500df61eaef7c7a824e9e9ab41fbb58 SHA-1: 1e450fdc0c0d7299026a4519ec60f540ed9db798 SHA-256: 79a157d2e564c979c1585c0d367974ce076a01221c5876965988b626bd88a68f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://de.ruben.pl/ckfinder/userfiles/files/xuzupoda.pdf In PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/xilataxun.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/52005278510.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091411043573499.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/pefegisimemuwozarede.pdfIn PDF document text
    • http://attlas.center/userfiles/file/54441676551.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/40324827975.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b2fd0996---vurorufiwizo.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/wepogugituwakuvivil.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/pigomugotiwonixawife.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/73897079014.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/pekatomefelop.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/55145852299.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/pepupixuzeda.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/pexuginumam.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vapiwe.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9b877360---48354237626.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/tedek.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86019846665.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401b2189688---19041199299.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/78099380749.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/25256976924.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/ganulevavufunekejepaxama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+11+emojis+downloadPDF 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_off0000ae59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE59 14108 bytes
SHA-256: aaa19883aa22b05377586aca25929fd2fe2c5804c7a2d8deb8fe76560228c7b6
font_01_sfnt_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 10560 bytes
SHA-256: 28dff2872d167406a71909212e0bfa99638eb19557f4a4c18f5e38847cfd77f0
font_02_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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