Malicious PDF — malware analysis report

Static analysis result for SHA-256 c803c99843701c0e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 04:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 090421d38165eacf2555e41f198511ab SHA-1: 132067755dfd800e40e4c8beda9359a17abeb6d6 SHA-256: c803c99843701c0ed24e694a6f3dc74bf7a9edd752d3887dac55b098ab4b8bdc
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=prueba+chi+cuadrada+pdf PDF link annotation
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/25270663010.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/94394516937.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/ruvawopun.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/wojataluzegage.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/jazofixipalupo.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/wesibotokesozewa.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/13719168129.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/24458478040.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/476da081db17667b1321b7245455dae9/kujusuvozovogigasogulari.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/33593992278.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/13644157971.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc1645a6be---wolinubasesiba.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/73487958066.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/gisutejizabudakesezi.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/zegirupilo.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/lurokilelesovuv.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904205951602342.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/kuviribapasumotovo.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/84565987235.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4vom5rsvo7boqk6661lhutg932/bexapifiwi.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/belomitufuvelutinor.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210902064914_72411819.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d900aa7744f0e5a85be199e0100272fa/rurebatiwobixorivuname.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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 19092 bytes
SHA-256: c6417baa2b189a932982c466016c96c8b5aaf58057b534ef9d8790ff049d1897
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 10424 bytes
SHA-256: 1ab3777cee30ada4f48da4ca16b72fadad8db74130290d6cc2899589917fb71c

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