Malicious PDF — malware analysis report

Static analysis result for SHA-256 573858a84d37ab3e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 09:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 912a5d43a6a144043274136bd05ef0e6 SHA-1: dfa3ecc28de14d3531a2c5609464b3e05b2555d1 SHA-256: 573858a84d37ab3e68113b0e86bcdfb6cf8180d010c103cc02d7707396d45c33
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF containing embedded JavaScript and a link farm. The link farm points to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the execution of malicious code or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ijtm.in/userfiles/file/94383130042.pdf In PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/88961460982.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/zexajuzopaluzexelul.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161507047df40b---70294507003.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/femomenisopasevaremupa.pdfIn PDF document text
    • http://proxima-design.cz/files/file/73411732698.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/53123943754.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/47380554057.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/8928818656.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/60253970181.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/31323125231.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/34672464194.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16144b4ec57c3b---5347279813.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/50204143800.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/39335262875.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/dibodumarug.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wapebizakezamasafuxexu.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/17855416435.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210922044504_d0c28r.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/sozoselap.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/63401802056.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210917045327.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/44726347017.pdfIn PDF document text
    • http://cripper.de/media/movabe.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/72052401914.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5fpfs1fgq98q8nc8k15en2sg23/lidowedexekuzorizes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=k+means+clustering+objective+functionPDF 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_off0000b0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 11108 bytes
SHA-256: b56c2b27af32150c01122484bcd8f8f60fa536b36da28e4da737d7392683761e
font_02_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 14520 bytes
SHA-256: 3b8bf59abdd2e5e91149c127317bf6d57b8befa097e86c3adba9a982407609cf

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