Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e406c2fc891e60…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 14:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0b2f2cfc3879b60152369e2e2bae2563 SHA-1: 226436a8d3b1f76882493476405ee60ad446ebee SHA-256: 54e406c2fc891e603ade2fa584581f037032d3722b05d728854667d51405c34a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 Security Software Installation Disablement

This PDF file contains embedded JavaScript and multiple external links, some of which point to compromised WordPress upload storage. The document explicitly instructs the user to disable security software, a strong indicator of malicious intent. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://aynadakikemalizm.com/resimler/files/52841760331.pdf In PDF document text
    • http://autosklo.sk/pictures/file/loverepev.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6oagt643dp0eeik225j2tj8rmu/62461426436.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a061623920---gupaf.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/22332896734.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa9228aa9d---60235052717.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/57624065946.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109062154019766.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/4150625150.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/9886213803.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/vewelemivalapafakiwipe.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/96965349757.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/taduwe.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/1802f177fc19fadac0104e43ed3354fc/29511711835.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/80588415129.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/46292004531.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/73340578243.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/ketoz.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/12367263199.pdfIn PDF document text
    • http://lagrupacio.cat/file/jirowunotigijiwasuronid.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/305733092613186e169262.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/muxisofakajinoxu.pdfIn PDF document text
    • https://panoramabyty.cz/content/97239601406.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/risani.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/koximunuj.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/jokojatadugibitizim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+solve+there+was+a+problem+while+parsing+the+packagePDF 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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 17780 bytes
SHA-256: 8c6962517f1d47750691748b219a693689e491f92fd4b5841f6b1e9c812228c6
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 11196 bytes
SHA-256: 42e2b13b7306b9d2dd4853996830d5a33e3c2bf23be57ac323ecf686550b27c0
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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