Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca7a2a3b1390d2c…

MALICIOUS

PDF

66.2 KB Created: 2021-08-10 00:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e2f0a59af922b9ba8ecfe5d102c61ff SHA-1: 56dfaccd6818afaace6785f8986db47ba947b166 SHA-256: 0ca7a2a3b1390d2cc9b16d9eb7144b1becf61626e1ee6e52c62fd91cd3246e19
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely serves to further obfuscate the malicious intent or initiate payload downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6614

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://catamma.ru/uplcv?utm_term=hodder+cambridge+primary+english+workbook+stage+4+answers+pdf PDF link annotation
    • http://dermatologomiguelgallego.com/miguel/fck/file/92351539506.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/wokovugelitapotofo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e90308e5c5c---31766913497.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/41775969072.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/r7fguq2pjh7if1b958tf3b9a1h/30453733703.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074326c820d9---nabofiwelivaxazavido.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7fa92521abad7681a8e82784f1423a50/59158191494.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ae794176d---99282589109.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/waxafodudiliritalawele.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cpgt5mvbfnbgsp9l89uejcsnr6/somakixoguvofavuf.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/88045051356.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/64102002731.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/58758144106.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8n625foobugdo032oj5c47pa36/lusow.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160854912217f7---poretudasebuwu.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/jumozekedifupelaxajopef.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b420000a187---zonaxaniwotikij.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dc32f336cf2002a03a5b5f9571248a79/wonakanidezozumanu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4f810818---13791207367.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/biwinerikuvurigazed.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/ripegikojabutidosokize.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc69db5c4df---66090773125.pdfIn PDF document text
    • https://magatek.com/documents/file/26111664453.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/24209644993.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 11568 bytes
SHA-256: 3b31c071cb711abd44cd8095a28f1042fdcd3f9aec56b8ec05ce0a3a210b728e