Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74d6ef5f90d40d9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 19:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3047895e884e1b670138b274a460f0a5 SHA-1: 6091665ca2cd9823348c9532b8886a9175dc39f7 SHA-256: c74d6ef5f90d40d912f7f8aa5179c38d0e3eb70c012e0cd0b5eab91ed68acc5a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maintogelonline.bet/contents/files/47909461039.pdf In PDF document text
    • https://suacuacuontoanphat.com/upload/files/suxeparimowopulefit.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210907062023.pdfIn PDF document text
    • http://www.agot.pl/upload/file/kazolozemamafawarox.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/87557810788.pdfIn PDF document text
    • https://blv.by/upload/editor/files/rizosojisifegogoda.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t9t2iehsfdands4os1iji1uibl/4120787181.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3e23bd2701b28b4eb529169eacf17eea/15705986019.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/43927562811.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/pusopixetozat.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/nuwufulajod.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/92207827264.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/sipusewovewixelupe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142149ca1650---gexagagogumojozagusem.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/71249466713.pdfIn PDF document text
    • http://topstec.com/d/files/jijodupadaluvubikap.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/taziwenogatoxazoto.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/nedokerurepaje.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/35465488281.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/busakujibo.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/judotexulefafakulal.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109072131305576.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/poxuke.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/41685017302.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/65268716398.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/tubexategosotajopizopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=computer+engineering+books+for+1st+year+pdfPDF 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_off0000bedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 16816 bytes
SHA-256: 7f41115c8acb75dd3b885d5113ae73d4cc7a0239d6bc2dafec95939bd81a53ee
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 11324 bytes
SHA-256: 242f03f5eff736844f53306c486fd02cedf179730ba64abc9591e3707a756cae

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