Malicious PDF — malware analysis report

Static analysis result for SHA-256 32eff50b481f4095…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 02:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4b789727f1692fbb49ecff19d114c0f SHA-1: d0bb67c08827322c830a28778edc2f4e4ea9bfe5 SHA-256: 32eff50b481f40959019ead0c1dfcf4a7917d873e824d4deacddbe13d398d9ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely used to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 https://infrive.ru/uplcv?utm_term=a+quiet+place+2+full+movie+torrent PDF link annotation
    • http://vucert.vn/uploads/files/suzofevomisobomofavisala.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/soduzixejakokemumisaza.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/beferefasi.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/subigan.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/nevuzamisazidaratolo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16150d242c5f23---sogepupukoxularameduzuku.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/28366057383.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc4778359---55549967398.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/xegun.pdfIn PDF document text
    • https://rosycaffe.com/file/lapafaganobosawulidisaxud.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/detivakevatawubezuwowope.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/28932425541.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://salondumariagededijon.com/userfiles/file/juxevox.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/11564719339.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/31763792975.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50964168422.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/27024446843.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/62290036490.pdfIn PDF document text
    • https://ruja.lv/uploaded/file/wakilirevofapa.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/rijulu.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/1513859810.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/95799711061.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/jizureniwodela.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/jaukfvgndocrj0cnq27d9nmg33/ribasuzanuzikanufok.pdfIn PDF document text
    • 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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 15124 bytes
SHA-256: e87b98fe7d56c814aaab6393054ce7eb23c4230338e76512b55cd3fcbd0aa394
font_01_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10884 bytes
SHA-256: 3e9eb12c9dd296bceef5d20bb7f0d9330ece9fc0b692eca323b84379e728b53c
font_02_sfnt_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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