Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee46870b1e51f7f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 08:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8dec48ac9c907d13ab4e091b508bf2cb SHA-1: 5dba4f2782d20ef210f1bacbf551cae9117cf6aa SHA-256: 9ee46870b1e51f7f1916b1c7251be822aa25b65b21d7210ddb31330f6aec6d33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document employs a social-engineering lure, instructing the user to install a browser extension or update, which is a common method for distributing malware or stealing credentials. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, potentially for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=edit+this+cookie+apk PDF link annotation
    • https://jakspravnenapsa.cz/userfiles/file/79311678582.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109091505489070.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/18943201935.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/92581912747.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/73159372094.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/89830021588.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c0796194685988e2f697faa0ff96715c/jutasos.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/sagoxifenevezazafixada.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/85190700591.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/59990007619.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/39609044781.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/nawukevewotodanuvawa.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/mozatuxomumevode.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/66561458490.pdfIn PDF document text
    • http://4bx.pl/public/file/fafagurixekanizejara.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/66456352675.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/42029463515.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630669512bVQp.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/kunonej.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613933ee2b5cc---434197963.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ecd42587a616d47d86a9e6f142185489/14316930136.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/beviw.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_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 19548 bytes
SHA-256: 9df46a56ed5d2ae06c63b3e9a0ee06ed2495dd67db85b0526978b37b64d12f40
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 10436 bytes
SHA-256: e77300d0e3947db6356f797e42b887353427b9edd9e5563a0e7c07e7775f51c4

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