Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dc9c65eb956b86…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 21:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4d46830b8769dfb42c551425adeeb7d3 SHA-1: 95765b7b7c9b31f5a01b659c9848b017a9a53367 SHA-256: 40dc9c65eb956b86df1361ab9bf717e3e21a82c1bb76d8fa7039e10fedca6a81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, hence the inclusion of T1059.007. The primary attack pattern is likely to lure users to malicious sites, potentially for phishing or malware distribution, making it a form of spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://an-professional.ru/img/files/file/87657666476.pdf In PDF document text
    • http://hanshintech.net/data/file/dazejawilomovoteparu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3274433915265a22a980e69b713530c1/37229700877.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/vifomosawojotupo.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/83490591368.pdfIn PDF document text
    • http://davcpundri.com/css/file/senuwikefemomulip.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/zuwokimukixajuzuwatizag.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/wuroriza.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/tojiloxatalijikod.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1cce1578---71564999869.pdfIn PDF document text
    • https://tcremich.lu/files/files/debasojulesawel.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/fdoutfq4ggib4b288e3oi41ilb/68465323921.pdfIn PDF document text
    • http://wdnederland.nl/file/1940873928.pdfIn PDF document text
    • http://royalgroup.at/tmp/mimisudafudijoremis.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/rexeranu.pdfIn PDF document text
    • http://dhf-china.com/d/files/7192260253.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/86552042979.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b737c9f1473---22030558402.pdfIn PDF document text
    • http://aquatherm-graz.at/files/xaxozewozo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5205bc361---lorefobipumixut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb78283513---wukefiburero.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/jorebewita.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/d5ll9frlic264o80uot939uo78/lijuziwewobaz.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9af7506d45601dce112313d0afef87a4/rividumirijapigum.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/15535466261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=oxford+dictionary+of+economics+pdfPDF 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_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 10976 bytes
SHA-256: 8eedc6be15cd911bd619e3ca07535faf4336c5f8beac81261d613fc84de1bf1a
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 18656 bytes
SHA-256: 071ac0065810c1eb90d2f6cd9ad82c56cc9ed66aa93c69f133c9216e6fbe1f29

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