Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbb56933dd2c8cd…

MALICIOUS

PDF

75.4 KB Created: 2021-10-14 02:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b049af4bcd07aa82e3ba8c05072583e SHA-1: a1a186f5dcd2d7b0f5d9014b25bdfd4db62c3e77 SHA-256: bcbb56933dd2c8cdc30f0440d3e3f8a638e171cd3c9373e7e6399599559bd3fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mimpishiosatu.com/contents/files/73142293222.pdf In PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/99225937532.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/18150585020.pdfIn PDF document text
    • https://slavyansk.biz/userfiles/file/terosolimesinuzekenoda.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/megewuwaguwazozomi.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/535531018.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/7236522594.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161533a95b9454---51341645807.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/manolejerem.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/41812784321.pdfIn PDF document text
    • http://markone-tools.com/upload/files/lepeguwixixapi.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/32940971207.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/4720510096.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/40814873545.pdfIn PDF document text
    • http://soupworld.de/upload/file/64924080015.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/17987666758.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/53c8d5d2685b58add33d86888a1dd39e/xotetobukiwi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b6e7af98c5a7ca0ecb4fc0400ba27819/xedufebifaja.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/sosufonaker.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/guzukumevej.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/4aa1a55c7e42bd36e68052d366b3bdfe/69037993345.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/7111230690.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/jipov.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/Z3ufxtS7Wvw/uplcv?utm_term=asus+a6r+service+manualPDF 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_off0000c26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26E 10488 bytes
SHA-256: 29d1d3fc2f6ea5373158f8513dca3ee61a0596fd29a0456b17a7d0dafd109ca2
font_01_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 17564 bytes
SHA-256: 02650ef5e1b1fc7f410e50c1f9d508e4cd5e6b0930eac0c6bdccd4b00d7f1035