Malicious PDF — malware analysis report

Static analysis result for SHA-256 37982801531225bf…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 11:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 26ae977b32e16e77907dfdfdb836fec9 SHA-1: eceb481a5c5735420c506fe2e97bdf19241dc887 SHA-256: 37982801531225bff4a6adb2f993c5766938e7d39eac4e98c92c92411d6a55b8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised CMS uploads, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials. The presence of embedded JavaScript points to an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://catamma.ru/uplcv?utm_term=sullivan+algebra+and+trigonometry+10th+edition+pdf+download PDF link annotation
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0829469ca---85847677135.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/10138212925.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/raxupux.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/fiwomuf.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/fefumazepebamoroxa.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c3c100226---jorudazogasuroloduruweja.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/5367059300.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/12902964981.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/gisikobezabupubipave.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/wimojajunurududimerul.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/buwafidosukugusewuri.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/mixovafobonotorab.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cb38bdce4a8f5a211afd3a60270bcc4e/jemetame.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1da776b2af543644f796be7e3d0e9598/bibukixesowubel.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a801936bd---paxiluvidojimid.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/refuresetukezipez.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c880f5eb70---vagenuz.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/vupareboxotorewofokaxo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8c4116c28---bafidovekowokizexedafano.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210607043058.pdfIn PDF document text
    • http://unityproductions.com/upload/files/komuxonuvifikebe.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/85262507777.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/90180448480.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_off0000c36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36D 18456 bytes
SHA-256: 9ac67e670475ebd133e3a748f8d65068f01abb819a84c4e03728192bf9c56d5d
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 11532 bytes
SHA-256: c381c9f07558626cc416b33d9e1fb25beab48480b0d9e61ce4cfbeaa59922ad9

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