Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bb1c38d9b08ba1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 21:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56413d2dfa42b2f9a0d0685f0497bd90 SHA-1: a86d0d7cd4223fa4aab9278a3ffbb71c2d6b42b5 SHA-256: 24bb1c38d9b08ba1c4bbf873b785c0e9395abe2e3be66b2b7e784e32f0a2155d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=visualize+the+future+information+pdf PDF link annotation
    • http://sfipl.in/userfiles/file/80100892069.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329b95be513---28883564649.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/kefugepuxeduvezi.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/wugere.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/24790867554.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/60629944370.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/51873575545.pdfIn PDF document text
    • https://guijek.com/userfiles/file/60429200622.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/49824101570.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/79003910182.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/josobip.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/85249089322.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/70600958536.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/fivome.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/mijigapotazimugof.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d185558d7---degagetavimazar.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/sugelevajivanojutajoni.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-1/20210901075125499531.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/melenitonavugezaxevibeta.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0dee917---41148248199.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/51925292656.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_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 18408 bytes
SHA-256: 0383bfc63013632b74513b2c5ed133cbf48a786cf7159b199bbe4f97241839e8
font_01_sfnt_off00011904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 10892 bytes
SHA-256: ba1e3409036e34b498a8b2fd8b9b53ae26372f9c3c534085385027d79df62e18