Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce1aaf494345d0d…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 18:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 77468fb9cb281b86ed5f564172190494 SHA-1: 99d1d3cb4eadcc813d01665d1cdafadbadc7eb40 SHA-256: 9ce1aaf494345d0d21a6392421513c92ebd3a119383285a90a2fb3ae363dd9bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a phishing site or download further malware. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

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 http://queenart.kr/userData/board/file/35146444219.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5d97b0daca221d8f723bf75ed9d7b1e9/xivudadiralobu.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210913205821.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/43192235987.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2d332348---jagotuvu.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/waxaluzujezew.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/tawulix.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34134212624.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mikowosefaxizenazusawoxe.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/54421269055.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/51203488425.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/72512469706.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/29596913673.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/10089004315.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/figikavad.pdfIn PDF document text
    • https://papiratisk.cz/soubory/48314257951.pdfIn PDF document text
    • http://artdental.hu/editor_up/91910186868.pdfIn PDF document text
    • http://scpt.it/userfiles/files/14483932223.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/17349991221.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82af972ef---17888327491.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/46721873220.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/9982711276.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/47130485795.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/78347058902.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/68592329668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=app+freezer+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_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 10220 bytes
SHA-256: b15d0964ffc47ba0f64b501ea8c21040135955755fd5ed29ec54513ddb9399b4
font_01_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CF 17284 bytes
SHA-256: f30a62e7e2984c1593008d4a87b6d27b6bfb3e5d0c0e9a802764629eeec15bd6

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