Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c23a0043e45fce…

MALICIOUS

PDF

393.3 KB Created: 2021-08-09 15:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 27d86717491e1066b45ef587a14ebf1f SHA-1: d952de144db2b62571828621513fc3fc641695b1 SHA-256: 74c23a0043e45fcef036a5163840fa861089c5e3a6f252d340213abf9e50e15d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8992

Heuristics 6

  • 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.
  • 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://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a722b77b7---woxorenuxo.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a56078c04---xusetaxedebaj.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/vmg4ii11dim0coharjbaofmp33/wunadoxatamerisojivejogaj.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21836212541.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/36553378900.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/30413898403.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/48215365977.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85593b11d2---zelaborakarixina.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/59530001760.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/tudix.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f346e2618---nuzinuta.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/06d76cd42a75a00c89fd70b6ed94fb73/70741924285.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/39364814098.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160738fb3bac8b---wudubipakupibikasejukabu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ed84721404a2263741edc98475459af1/voxowubopemed.pdfIn PDF document text
    • http://turnyras.lt/Files/file/nedozuvu.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/ponebuxejuvonawu.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/21908373154.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/33895b7e68e135289f0a134e3f82b1f4/fapamerekedewe.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/jolafekikipasu.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/joriworoxuwiwega.pdfIn PDF document text
    • http://aimic.com/userfiles/file/10927837586.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/4c3ee55b871ee25422c296e231e00f79/zumuzojuvakuf.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f361eab2---kizalafemuwiparokum.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092176d1b22f---18294931242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=como+saber+mi+nahualPDF 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_off0005a890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A890 23768 bytes
SHA-256: 72bc7d4c29bd4391f7065c1b92b3a00b0714b37c844f05554b0cf22e84366eda
font_01_sfnt_off0005e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E47B 10544 bytes
SHA-256: bec8420fb18bc98d1c74f7526f50184028c7ed931ca1e0d7a356cd042870eac0
font_02_sfnt_off0005fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1