Malicious PDF — malware analysis report

Static analysis result for SHA-256 588ef1200ac6b56a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 22:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec14269828e4e0088690881e45ccdc4b SHA-1: 7c64b0b98bb358df2393a5750a186a3423d5c486 SHA-256: 588ef1200ac6b56a5525ca502830161091162925f0f7235b950b4a1db97048b3
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common social engineering tactic. Multiple external URIs were extracted, some pointing to compromised CMS upload storage, suggesting a distribution mechanism for malicious content. No scripts were extracted from this sample, but the presence of external links and the lure suggest the document's primary purpose is to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://philabc.ru/uplcv?utm_term=armor+beast+arcade+fighting+mod+apk PDF link annotation
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/majekubesikinenotikubot.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/83880577263.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/21176866467.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/36114151467.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/zoramupibe.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b1ce1ab22a3276e9f94de5199cdbf715/nutukirewelujevusiwa.pdfIn PDF document text
    • http://yoron.net/up/files/nuxamapumaxumusiwesozulu.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/92171419181.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614009d69a5a7---65959861516.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/38443635535.pdfIn PDF document text
    • http://seamacros.com/upload/file/67746048309.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/vedofejerudezafunegimago.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/23845915169.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/besumolegagunu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/levatudixilolibotoja.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7b99370a2---33412131707.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/9179104017.pdfIn PDF document text
    • https://skostishoes.com/userfiles/file/19795802623.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/83066360646.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0d6a9f8d---48247390277.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/78122279020.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/taxezoli.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/98750044707.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/28507988332.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/zubijatevomon.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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 11236 bytes
SHA-256: c30034d74aa6d39a1454d3b0f32ed24135b2e8410bf8862bfb5da6febf102503
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 20180 bytes
SHA-256: 4f1f321e6890983b52c896cfed64c73b3777549aa4b265e6c29b1e2f1aee50bd
font_02_sfnt_off00012f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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