Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1172d6da91803d3…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 01:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83e7bea6df5695868532819757c8a632 SHA-1: f9695cbbbd58a3669c6f02b235036a7da0cded84 SHA-256: b1172d6da91803d3082c291d20159693c6f5e6b82bb5ff76aa3049a61415b4d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple URLs, including those hosted on compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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 http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/ponolatavivurinosop.pdf In PDF document text
    • http://ateliergermain.club/sites/default/files/file/mimexuwasijobopi.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210903131105.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8a84f0861a85b38ce472737041de28da/visopizafira.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ba402b182464466a353a54c1f6cd8739/90666701738.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/rujutatifugibovi.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/mafepajojalowag.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/matatilugow.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/sajile.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/vidozuzidure.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd69584cb---64120249409.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/tanoleruzifewewilizew.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/kuxumenenotivowa.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/jafopizatajukalodisokusiw.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/lonasifopif.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/85785387299.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210914090648582.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161318dea9ed74---24758223424.pdfIn PDF document text
    • http://activsport.ro/userfiles/file/8390884847.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/78139503488.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/pexikita.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/nagakajilizitewisoxogeke.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/muwekifeforepil.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/salap.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/famamimopugene.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c571ec302---36491509674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=demon+ps2+emulator+apkPDF 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_off0000b5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 10636 bytes
SHA-256: 6a59b2c4f5889f7c847443be76b5d098fb60f2d6ccc1f65f94e16c5f8bf334ee
font_02_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 15136 bytes
SHA-256: 6c1160de589cf3429f4d9bd6e53df607c5d3868446d7eee79fd017fb0067a66d

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