Malicious PDF — malware analysis report

Static analysis result for SHA-256 2559081aee45b6ca…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 17:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4130af670df70ed1ebaae9f3f75b00b SHA-1: 15c0dd9c7fb0a6398eeee4887692c3e9c98e561c SHA-256: 2559081aee45b6ca441cdd64d73871d45941a40c07308fb9c34ab88eff9e7f69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://medvor.ru/uplcv?utm_term=mi+phone+browser PDF link annotation
    • http://1carl.com/userfiles/file/74684249037.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9b99b17a---32668683368.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/48261347960.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/1446095811.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/50766692996.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/73791380730.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/96487844080.pdfIn PDF document text
    • http://webbuilders.com/files/file/zidawi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4tqk32jup1iql7g35g4l3m9hk9/15103682622.pdfIn PDF document text
    • http://soc-in.com/data/media/files/70885013530.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161369f466a6a0---57186132078.pdfIn PDF document text
    • https://12shio3.com/contents/files/tedibabizar.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/putipurepe.pdfIn PDF document text
    • http://373113.linker.tw/files/6947759119.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/makunuzesij.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nabuwajivobubiwekaworufi.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/kawosifuwo.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/rosotasipelite.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/xokezinejadutijitinez.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zapepirogatikinakiza.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/32690664993.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/48584946416.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/69783410226.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/palulusanafesef.pdfIn PDF document text
    • 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_off0000c4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B1 10260 bytes
SHA-256: a8deea0869795fab1e2254630bcb8d7edde65c9ef69106d109277b4c3c1f4546
font_01_sfnt_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 17116 bytes
SHA-256: 87a19c5a82e40f76a38b08154abb36b2a51b3a9ee33a2d41a9b71cdc58f58602
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.