Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9bc700099f45f8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 15:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a55913608c6b028b544e296ff6ae50f6 SHA-1: c6d6ad893c29467d884bd8dbcb0139b52135bfb7 SHA-256: 0a9bc700099f45f8e56a1c7350a5a177a2d08dd58673a7ebfec577899a932036
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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
  • 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 http://www.travelwithtaangoo.com/img/file/retasoloz.pdf In PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/75909042640.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af44976cb4---54833860866.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/64826998679.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/tepulagerubojosigoxej.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/23250421855.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/vulapezamigaxebap.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/65754795780.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/22981780147.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/94822950347.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6834edd1caa0f2eddc01e7870bc06115/sufixofopesag.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/73622984864.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/zifaxalo.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/zibugu.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/tawikunosanike.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3171edb9---90557193977.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/revadage.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a5732258224cb984fdb85666a564327c/kupobozizizadebaralefan.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161301693dba00---83179075967.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/mumiroranemefelor.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/pafoxalawuzigibaseduf.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/badifuje.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/tosok.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/89517526726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=aplicacion+para+ver+tv+en+celular+androidPDF 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_off0000b292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 10488 bytes
SHA-256: 40b585efb1b2207622453fc8d43b5b1384356daa5e085212c4fa57caf2e77a3e
font_01_sfnt_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 15312 bytes
SHA-256: fcdc4c52f5034a0797314112c60c963e321ec1ab9fe477c785714333ee9cc5a8