Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af7d7389a7f3f8f…

MALICIOUS

PDF

109.9 KB Created: 2021-07-01 21:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 34633d6776da0d187c25a646e61e7788 SHA-1: b3a7362bfb566357ab30f8b9771af3fbc502bf20 SHA-256: 3af7d7389a7f3f8f77f015f4de9912bc14003daa47e3de91870dd19352917549
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The presence of these links and the overall detection by security tools strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=galileo+was+right PDF link annotation
    • https://acryl-bg.com/userfiles/file/33894491686.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3cpsjhrb3h8stnrmmijo1bt45i/javavozazo.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/jasugesupegowedu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/teratepolutibisebebomemux.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/natilodipadoxasudil.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/konubizaf.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a260b97e3f8---lufagifogutiwarinedaku.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4590531e6472bb6cb0cb5cfc91f7f600/zajomaduxunatabivoges.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/c6382ef991d8a7623c873cd4f20dd65d/fovaxupuxovo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/183208ef7d89d9552a27bc4fc50bdbbb/romugegobozolisimafuta.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0598b23c313de2d845f188c970fadb54/wimemagunonifokexikafup.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b14700a2e78be72857c3c3e6a3552608/resubalarabe.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6htpcg01jqe6jc0qhag6rdeug2/fasotuwekozaxawiwiti.pdfIn PDF document text
    • https://signika.pl/Upload/file/9480978003.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/32176921148.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/redodamuxumof.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/sunixufovogasanewedulu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607009941896e---guperu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8a3550d65189cd26afc2a86343102490/sabamin.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fef2a90cde---57680745064.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/df1c238e010eeecc7c483695e7376449/tuwobufenixigux.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///62235655212.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/2249791997.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_off00015016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15016 16700 bytes
SHA-256: 9ace63e4688fb53ddd40c83e75b1a938a8b8a1ecd7fe03279fd43b6da5ee1b49
font_01_sfnt_off00017a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A9C 10408 bytes
SHA-256: f10e0c77c2f59caf9bfc1b4b199eaf333c4502d977c5f694df10c32b37cc964f
font_02_sfnt_off0001926e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1926E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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