Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40c6229bcc0333c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 17:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53e70ea5e5fa8e5b1ae8ad9657bbf758 SHA-1: 201b74603c89bb34b0777e39746008d7bcb210ae SHA-256: e40c6229bcc0333cd3c04e77a2ca075d76d27982aaf7acc45ed4f09d68e6dd66
216 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to trick users into revealing sensitive information like private keys or backup codes. The numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggest a phishing or credential harvesting campaign.

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://pixomot.ru/uplcv?utm_term=freddy+3+free+download PDF link annotation
    • https://nieruchomosciprzetargi.pl/files/file/31979369644.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae490da986---96662549871.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109030705256312.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/71037104418.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090714581667.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/43440025656.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/gisarom.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/kebidiriv.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/vodoxonizikux.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8845eea67---54227269332.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613572c60e3c4---ripewiwabomamokuvasunijiw.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/lolutofepojadabena.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/95837383578.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/mulabetij.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/radod.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130527e5b9de---seruzebijaxevojesulu.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/gesepewim.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/57551753300.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/63ab27f8c2b1b0822b62104c10e4c91e/toseditinas.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/letusagodu.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/fabaduwekopovuxi.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/60563601248.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1c538b1a84fd315aff4454bcb6035e74/zuruwulo.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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 10340 bytes
SHA-256: c529cbddbd67716497db7289833100d3c565aed6b1e88bf8a0096db988083526
font_01_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 17624 bytes
SHA-256: 2f13d2a7c80dc9eca0dbfb19c7e88fba02dee9f58fece1336f9e57ffc44470c1
font_02_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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