Malicious PDF — malware analysis report

Static analysis result for SHA-256 57438930c659bc93…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 11:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb81a3560b075adcb78e2928e9370d64 SHA-1: 5e69a2a0a5c28b16b7598d60da62d47e2c5f538b SHA-256: 57438930c659bc93beddec1540d40553cf3b04ad011c983552dedcbd7a853194
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jdsliquorlocker.com/nbloom/fckuploads/file/74001268958.pdf In PDF document text
    • http://csc-021.com/userfiles/file/20210901112518_zlkjrg.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/7508664213.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/jofukupazufuji.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/muzuxipe.pdfIn PDF document text
    • https://adci.vn/data/upload/file/desosegamute.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51cd8bf22---65482034222.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/warazatawulere.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/42459276010.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_06_20_46_23_4450.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/31142665119.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/28363843255.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/xarukesarajitelovi.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/fugudipuz.pdfIn PDF document text
    • http://wawa757.com/uploads/files/1084154277.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/90787480563.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161350f6a9d447---17375433038.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/darolatuwotalukure.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2955ab8a1c69a570835eaace965c7bed/66863431476.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/50144184054.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/muberop.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613637a3efdd8---69691953976.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/47399834292.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/75393749697.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/14181479827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+sport+stream+sitesPDF 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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 10240 bytes
SHA-256: 277e087e0f3e7aa9c2e2eaa65c75f16fdf5dad56ac5c7002957855245b179469
font_01_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 18044 bytes
SHA-256: c277f399738cb0ddef6940529462cc050258759fdf3b746e32ed7920d72c7ea5
font_02_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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