Malicious PDF — malware analysis report

Static analysis result for SHA-256 d373b81f5b7f34aa…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 06:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28e8cf0047840c284338cdd7e4d5f44e SHA-1: 2e634a2ad116fb0c44afe57cd3635993ae67ba0f SHA-256: d373b81f5b7f34aa8518ef48f2f733f4d30bf92e1de0f0421e8f41f17714425e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, directing users to compromised websites and potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aashianarealty.com/file/povunifupeginiboxonoru.pdf In PDF document text
    • https://bahceneryaman.net/public/content-images/files/30597220884.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/bamuvewolu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f86cff774ee95a493e473adb5984571b/kujovavamezuwemuxopo.pdfIn PDF document text
    • https://clubon.top/uploads/files/gugewu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/42729911441.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/paworolatitiketipet.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/67166032716.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/19288598588.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c5e1872a54996d7e35f81e4d48b8fdee/gilalata.pdfIn PDF document text
    • https://limadelimon.com/images/file/bovuwuni.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/64899313977.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/gukapavip.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/75756975489.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/38599721300.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/xepazimuvepip.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ecb4b4d191377dc5caa62c7a44488f04/tozik.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/58484356131.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/91511426189.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cc40d43872b9d6b3388ac0ae4c009971/60820977901.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/jelitifawovokawu.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/92380137134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+rom+hacks+with+increased+shiny+oddsPDF 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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 17276 bytes
SHA-256: 5385006c0f0d279046135bc50561bb2925c0ec253cbf39fdbb6c85dfe2058819
font_01_sfnt_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10884 bytes
SHA-256: bfbecfa68aeae128104048ed4a612c23953ca2d1c48564548598bee018afbce9