Malicious PDF — malware analysis report

Static analysis result for SHA-256 95939872cda85df0…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 02:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca8bad7b13bb5dc3a0cf2aa00d07c555 SHA-1: ed5c7fab0be575af9543f427c4f582d4af3163d1 SHA-256: 95939872cda85df0ff3337cf5513dfe10062451aa8b51f1eee2b2026b28533aa
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS uploads or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to a malicious site. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://livstyle.ro/home/livstyle/public_html/uploads/files/polexonev.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/3939435000.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e8a3593c---91343529498.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/559e5ed0fde5bcdbffafb391ef1faa04/siraxevofijavoleli.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/73916098600.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/kazefidab.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/73445438733.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/21134321373.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/31865096879.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/bebumagoratazofuro.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/34410440030.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130258181be0---gisapetazukarubise.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/zabagilokafer.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/meloz.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/93167490602.pdfIn PDF document text
    • https://datenglagi.com/contents/files/mubuwowutumuzek.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/30751283023.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/30971427798.pdfIn PDF document text
    • http://18554080.com/userfiles/file/nutokekijikemoporib.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/24184230866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+send+higher+quality+videos+on+androidPDF 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_off0000b2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DB 11032 bytes
SHA-256: 689e1fbaf110c776f722c0306bc89b650333258d43a749180598e811cd5d6c05
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 16060 bytes
SHA-256: 2febbbe2ccf341d4c9b902cfa3f93d2c73a0d23b37c9d1c9250d790fafdc0917