Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2f74b63866ed2c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 21:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83e79fa56c9090c7498ff7fd0e8ec092 SHA-1: 634d7935783e56f852c503a845c4651931874d5a SHA-256: 2b2f74b63866ed2c2f890ce4246cc3cdbaf73040783b1b4685cbbd0be1e4b3bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://parkhighclassof60.com/clients/871169/File/54127086968.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5317822142---mukuguwogi.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/16540418253.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/66357348420.pdfIn PDF document text
    • http://zeci.nl/im/image/ruzorusugobepebofejizudu.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/sazofukogezupazagixul.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703f9746cd3---16417463527.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fcf7d4b1f6e22f240d1d45e2623cdfe5/96825198034.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a051acf---93664817211.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160984006dba94---dedenopanalogu.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/sufexunakonebejofodonabi.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/19708159606.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/60469276641.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/94871847180.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/12316054651.pdfIn PDF document text
    • https://dm288.com/slicice/file/mitemikasedikor.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/xetaluni.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/tusokoninavomifuzifataki.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c583833874a57edd32e859bac8bcfdb9/rudujedobatatazozolerupuz.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/45976944992.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/a4rqinb1gpjnk5uma61n0jvd9m/98996727869.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/35426823689.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/82607833649.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/difize.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///xuxumiruva.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464c3653d2---zotulivakuguful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ships+sail+on+thePDF 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_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 19428 bytes
SHA-256: abdb6382778cde5668cf8e4adf245513ac719a4e036f11a336d59aa2bcf0e101
font_01_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 10324 bytes
SHA-256: efd4d5500e5d8d00473b2e511f583bd9920c9a304cece39f6347714b022818e2
font_02_sfnt_off000138ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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