Malicious PDF — malware analysis report

Static analysis result for SHA-256 64850d1ad7dd288f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 00:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d6f76739afac82e41639d2c691fbc24 SHA-1: f7dd41dd9c3e8fdc216fb974ec201b24c5c727bc SHA-256: 64850d1ad7dd288ff4c360c5f5937d2f3779005fea273f55d7e36d2b446aebd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to manipulate search engine results or redirect users to malicious content. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for further exploitation in PDFs.

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
  • 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://archism.ru/uplcv?utm_term=healthy+relationships+books+pdf PDF link annotation
    • http://kajsanordstrom.com/userfiles/files/dijatewodolafijawezasubu.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/5c8d0fb577986e4f5c4cc1f3d50e042a/41574368083.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/14734310772.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/54002331146.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e194edc6597082b0871be6575ae14cf0/bawuzugegutegot.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kpuer08k4gv58fo2fpauuuan0b/vuzagewezilawo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5e3db489d---zepunobenupoma.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/66509194836.pdfIn PDF document text
    • https://samowar.ch/upload/file/21706879339.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/90629113071.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/sigubisawe.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/napetetekufeba.pdfIn PDF document text
    • https://nexusmediation.nl/files/59338739995.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4bfb93f61---1064407107.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/nudozefukado.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a730b66469---sebuvelafaxanev.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c892bcd560---75166164004.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9e3a77e2---zonorareziviluma.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/44900654374.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/wegipadodop.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/doxoxasotutapejudo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/47392a82e9e4d7b17798a5adf6e3e1d7/11195937581.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086867a7132d---dopuvogilulomuxaneb.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8d99d9d87a414b84959ba6cbf3122540/gasiwukunakelagaw.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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 10932 bytes
SHA-256: 5a5a8f02e12520eb67c31982479e64da95eb5fe9a29bbe8e15f6bdee37507034
font_02_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 18412 bytes
SHA-256: ac1db1946ab59fdf81e733512b04e1101adaaa86bd04781baab4480a3c25d015

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