Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63f988c49269694…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 00:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 410534e6b5ee8f66b47f1cda3316d1a4 SHA-1: fe5273c5ebad2645e3c2d7c822c2e1edb651b3c2 SHA-256: e63f988c492696947f31314c7d574721f7111f6e2b13c0d55d292cc0bd0f1612
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the execution of further malicious actions or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://coretry.ru/uplcv?utm_term=what+are+the+concept+of+ethics PDF link annotation
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4b396f3f57c01c1f6f1d9bd011ae031c/peragupu.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/nikiliwuwu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/24292045179.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/86950224112.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/83141591226.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/nijogojuvigidoxaj.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082100667a4b---kutololilafaj.pdfIn PDF document text
    • http://medrea.ru/upload/files/36530443117.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/74660937868.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/64734882143.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/63483983137.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/h0so3fd79tp34icgri80n4j6c9/loxokozegekavosereregosa.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/af68138fa3d38f8912ec315df7d01e93/61342580875.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8a04d8b9---metupikeje.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/61a700faf5348b060daa4319ecb48708/ziboxowitokekevobediri.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed8939560---pevofikekuripekitunegexi.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/manitaj.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/78123030980.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/konifeguna.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/69881538909.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efab40ec1---buwipodo.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/95496696611.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210710082423_zc28g4.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/45198528127.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_off0000bc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC27 15292 bytes
SHA-256: b75543819628cc7e2081064d03e81ec17c3b540abf49cf088d4501a7bd82d85f
font_01_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10524 bytes
SHA-256: f7be8d25f6febf6871309cb2f85a09a3aaf17f0893c0c4ecb57b2beb4542c67b

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