Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6388a81419313de…

MALICIOUS

PDF

74.6 KB Created: 2021-09-13 18:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d2fbb4309585bb1d777eecc1649a446 SHA-1: baac747cd6ee0b01d439c2fd70c54233b540ba86 SHA-256: c6388a81419313de6d0581d815b94d4bb374f4fb0607a4d475221a83f7554ce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=download+genymotion+for+linux PDF link annotation
    • http://www.scea.edu.mn/ckfinder/userfiles/files/53418948525.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d332437a6---81961794682.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/nudowulimotoparawepatum.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/lawuvuserixotolifuduvuzin.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/buwepilumopefika.pdfIn PDF document text
    • http://kasand.com/userfiles/21309563492.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/vebemolegok.pdfIn PDF document text
    • https://red-adlay.com/upload/files/zurud.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/93271041348.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-11/20210911191239223608.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613895ca1c1c4---27562293188.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/85502163424.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kusunomikefobojadarate.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/difeburesino.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109101238332205.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/069e4f6d590b375ebfaa267b0df416e8/83973697574.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/kapixaketo.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/67356343703.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/nagajipufasoro.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sijivuxive.pdfIn PDF document text
    • https://cooperspick.com/files/kifodamawipo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161354a0714289---7461087853.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/70023454503.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_off0000c114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC114 10932 bytes
SHA-256: 4a120d40e9c693c3873cd62268277fd99faf95c0deb2a8bb7ebd9789a24405fc
font_01_sfnt_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16344 bytes
SHA-256: b0b6e0150e3fdbb47d6ed97fa65f881223837692cff0c33abb0ef6a2c5c269ff
font_02_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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