Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97ea24dfaeed681…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 17:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ba480b4b197c239038eb8f70e6d5c76 SHA-1: b9332a622f5ee33afa7d4cbca8d1d06c416315c7 SHA-256: b97ea24dfaeed6812f9d321f59644a0b6e15e22d126726ed52bf8028fc8b33e5
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/tofiwumovupalirizobawu.pdf In PDF document text
    • http://chokmanee.com/userfiles/file/74328282649.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3d7e8208bebee4d03f959a1d7ad2e986/dapojimiz.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16226259271146149608.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/p2jjgvfirq218agg56koaej8l9/11191790503.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610307299ca65---84539697112.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/ronokopesatomotejoza.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/3n598jf98njc9ojmv3tmmstaqn/18595724624.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608401e820d25---48940480355.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/30ca10e314488c8c1608e81d0c1fb699/6424152503.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/20d22639fee216b689d8edcc12715d4c/1205948127.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/73736909851.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/nuraxiwodasazaluvulufot.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/delupozi.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/bilotofajo.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/13741297929.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912ffee96a5---tamavimotajabagavidiloko.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/fcb7b151c7f774012e7fd20256954752/rigofogotivuterokudetevo.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/9874446470.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/dudipi.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/jobowogosituwek.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4992b86982a5dd23f65b6e4ed346677c/16357735778.pdfIn PDF document text
    • http://accronline.com/userfiles/file/26801524097.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/tuwirerafojowirobeni.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/89818282687.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d0f5719a703c015dd624f32c1a6b2bf3/betekuzebesozusozuxo.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/73407278518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=vygotsky+theory+on+outdoor+playPDF 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_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 10856 bytes
SHA-256: e047ebb9138b918368e12c1fd76dbb722574ca0d6843e34b720f4062c42a2492
font_01_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 15968 bytes
SHA-256: 5bd00b0b00fd32fdde0671659e82a71a8f640c2f9686937ef89c29cb0210f55f
font_02_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1