Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1c2065ff9e5437…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 19:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 182dce48ae2981c51caf5655a8cbeade SHA-1: f7cad4e693abe9ce7b7d8f0ecf22d1e2dc59e613 SHA-256: ea1c2065ff9e5437683b9b685d4d1b6734ea055d4a65e0ad7c27b04f07664bc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5916

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cructi.ru/uplcv?utm_term=the+7+highly+effective+habits+of+teenager+pdf PDF link annotation
    • http://joeun-it.com/userData/board/file/79230396876.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/57510532089.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/lexigokadedejofejujonewis.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/5699272302.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/fakenir.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315672677f1---rerefabuxewepamififati.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/gugek.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/20081215960.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/mudujudegaduzuve.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109120015029843.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/bugosimi.pdfIn PDF document text
    • https://dacola.com/upload/files/dagetotuniwokibalavosim.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/17962049263.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/teduzonawivazu.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/kibefujopusujov.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/dijezonozelupajiga.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/54556260896.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1822afed29c84922e54a2cdd8fcdc237/24365777837.pdfIn PDF document text
    • http://quinta.cl/upload/files/xupirejimomapetaweju.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/wexorefuwawileronutamogaf.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/nofavamapato.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/19436986089.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/fugotawununawizegupi.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/bosepefozodiroliw.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613078e64ecab---suturapukasizagijenozolel.pdfIn 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 18816 bytes
SHA-256: 9154fe3ee8dab28e6dd096496e5e691acbaef32c6fd9d7ddeaf0e0d7a6468edf
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 11232 bytes
SHA-256: 917ba4df5a3a2b8d19cdfb3e8802a58f5279958302178c08cab70be39a7543a9