Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5f8fc96a89c2d7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 13:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ff154a407d673cbaac2f485683ec41b SHA-1: 6493f4418ea4ab44ffa55897e2eea649cfd5670e SHA-256: 9b5f8fc96a89c2d72e6dbbf80d3855eb6efb2ea0e85c6cba68e002ceb3add9cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites, suggesting it's used to host or redirect to malicious content. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further payloads or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d0bfad744319289be41d532beee6da35/56050556618.pdf In PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/48753182506.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160928e057fe5c---binefinesejogevalozig.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bn06414l9f5eajp4ujvnl5rag6/faladajejanol.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/bamusigi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33018e61---30508376290.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/7048119973.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/motopafotabozikodul.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/naxedifixuxupine.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021070523084673499.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/65094570483.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/modakawazotofu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ajmi5v16n23il6ocdjmfn6d94/33811358652.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3b62b3f1ed1bba8a7ee7e81c6ea4cc23/65815223107.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/29426414358.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/64240984508.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/laxexudozujupiruk.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/88016264171.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/mirasirulovofurobex.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/pasemijoli.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105294340a2b---13411484864.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/zudopalitetukoj.pdfIn PDF document text
    • https://dhesient.com/media/1245521453.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/99218302788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=numerals+1-100+worksheetsPDF 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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 10640 bytes
SHA-256: 4bd9f3af2a8090a6d63078182b61bbc0c39cb755069c755a8c622f6a7b7782ea
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 17504 bytes
SHA-256: 83ea6eee3b009e3e4455c496cd6e6eb46c2e7dd58b37194f64211ca6eb98c4c5
font_02_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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