Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bd218ea6df50b1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 14:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17d9f3f5e05957dc3dfa997f246dcfc1 SHA-1: 887ccf4fd86c8ed5129448e5918870588bc3d28f SHA-256: 23bd218ea6df50b1077a5e1498794d43f4fe01fdaacfe4ea69ffc3a7a8a03571
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable hosting domains, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://samngaimarble.com/html_upload/file/63514407588.pdf
    • http://technoprofile.ru/userfiles/file/jovusez.pdf
    • http://gaushalango.com/uploaded_files/userfiles/files/94785018787.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ac4c918126c977cbadfe4fb4d4ee07af/mutilevurip.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5e2a43d1---66333075193.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/68704646392.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7a4d11bd---55878686592.pdf
    • https://megacook.pt/site/upload/file/kijoxusul.pdf
    • http://romovi.net/sgi_userfiles/userfiles/files/lifazumirogimekisaned.pdf
    • http://tecniagua.es/uploads/ckfinder/files/tazosebenezozi.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161424e39c76d4---wuwatol.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedc03c02e---jufijopebazadaniru.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/9964293404.pdf
    • http://audiohrestomatiya.ru/content/file/85237886433.pdf
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/tadopuwesutisubozogipavo.pdf
    • http://dogable.de/userfiles/file/22866489748.pdf
    • http://w3-japan.com/js/upload/files/rogedamidirurifetewanidu.pdf
    • http://lideparts.com/userfiles/file/1630572693.pdf
    • http://bbhshipyard.com/userfiles/file/jogiloluluweg.pdf
    • https://maturana.cl/upload/file/dapolel.pdf
    • http://sowa-architekci.pl/userfiles/files/49145610371.pdf
    • https://mimpisiluman.com/contents/files/14306513921.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614472d33f28e---14038086691.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/52104949982.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vidmate+app+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e265.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 16792 bytes
font_01_sfnt_off0000fa7c.bin
b9a9503542bbf49acc49e35bdfb9709c674b8167f2d901e79f208689ba6f82bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 10540 bytes
font_02_sfnt_off0001127a.bin
21feecc2b52417813c9f1a0c06ba900ab6b994405e491d68db3798a31e51e820
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 17840 bytes