Malicious PDF — malware analysis report

Static analysis result for SHA-256 9159e362832deb62…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 19:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e983e4e15f9b321085f8fa86c4c7203 SHA-1: bb8165bd3c9382d7efe35a05cf0c0c22defcac8f SHA-256: 9159e362832deb6226fa21d28e9e82ac54271f4103b99f0859760232dc9c82de
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is classified as malicious, exhibiting characteristics of a phishing and trojan delivery attempt. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The document's content, though heavily obfuscated in the provided excerpt, is identified by heuristics as a lure for remote-support tools, indicating an attempt to trick users into installing potentially malicious software or granting unauthorized access. The presence of multiple external URIs and the ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://huntic.ru/uplcv?utm_term=vidmate+apk+free+download+ios
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/2738509785.pdf
    • http://etcpremium.com/userfiles/files/tosezakurux.pdf
    • http://hoanggiaphatstone.com/upload/files/64935273911.pdf
    • https://fablab808.com/nbloom/fckuploads/file/niwugadaredarusotexumuxi.pdf
    • http://ohdiabo.net/images/ckeditor/files/47481473955.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/88173893555.pdf
    • https://hobbes-group.com/upload/files/giwuje.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4f434f01---familalanigasezogozupiwe.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/21934161493.pdf
    • http://living-stone.lu/userfiles/files/53559434484.pdf
    • http://fratellibeninca.com/images/file/33923847997.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04b038111---12812125323.pdf
    • http://thevalleytrader.com/files/sowetanutemetowigisala.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e323adce41727ab211d6b96dc33c195b/98278359895.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dinukozoxivifamud.pdf
    • https://hilanguage-com-tw.triangle-design.com/files/tidojere.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161311465aedd4---92354024279.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/botukax.pdf
    • http://toanthinh.vn/webroot/img/files/9652526048.pdf
    • http://proleague.dk/userfiles/file/gawewovirijefobi.pdf
    • https://activsport.ro/userfiles/file/likubefutivu.pdf
    • http://saconsultancy.com/userfiles/file/pagepojewepusixig.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/41a3bba0ae722d1c1c72d32011d47017/bewugovutotigefudez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 16792 bytes
font_01_sfnt_off0000f9b6.bin
b324dac95fdf78a65909089e5d76da22845e5d64f7544e144e811ff788c833a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 10808 bytes
font_02_sfnt_off000112a4.bin
4bc8a65669f48c89767d00941a9ade69a6ff1393be451f809eea6118dea782c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 17248 bytes