Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d163c24d553db4…

MALICIOUS

PDF

67.5 KB Created: 2021-10-01 23:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6974ed3ba7df0ee4d5476a2ab9502274 SHA-1: fd46fa9c7ef74315ad03322d9e87f173020a5fe0 SHA-256: a8d163c24d553db4428dd38f1ce6a7d48b5cf70b4cf4577112fa3fbebc6d2a34
184 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and is identified as a phishing lure. It presents as an image-only document with a click-outward action, typical of a screenshot lure. The document redirects to a link farm hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://robbymakka.com/userfiles/file/58979668003.pdf In PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/36305815678.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/84333486144.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/deb90f3ef4c5caf18e36321047349177/dususomimijojafivebur.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613173464f6a9---kipoxuzi.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/dedanevotofabis.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/daxabet.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/3940603521.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/didekuzuxafeviw.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/15548315953.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/nezisi.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/55355943660.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/zodagid.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210928_134949.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109110259364642.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/40939115508.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/23414547435.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d6aecada3b827d12a132a675d7e5fae/vibejiwuregaremek.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/zikozutewoxabewolivofufez.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/rexiwiretepinote.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/67375226008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=horney+old+granniesPDF 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_off0000abd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EA 10432 bytes
SHA-256: 496ef293258e839f22d3744b7f475af35f4ec87c0ce2e3afe8cbf75945bfc676
font_02_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 14368 bytes
SHA-256: 91823ca2805524a0befec9bc96746ba63481d984e2b215e46945e05d7276f144

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