Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe387bdfd517e07…

MALICIOUS

PDF

74.3 KB Created: 2021-08-04 05:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69ce293fd074f83bff8a9c017979a1dd SHA-1: c6022c0ace0ab1bfc4d7b82381eb83501fdb000c SHA-256: 6fe387bdfd517e07d37c5f267e3eea0802c76b03a946a15778ffdbc9c04fc122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be SEO manipulation or directing users to potentially malicious second-stage content. No scripts were extracted from this sample, but the presence of multiple external links suggests an attempt to lead the user away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://mindatpeace.us/uploads/files/43350742963.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f90473a153---pefidaw.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/utvulecpdgk6f2eu40i1j0ftrs/6406148277.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/65812405003.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0effb5688e---75460148456.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab526a024---50351487924.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/11369068303.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/65439911133.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975df3d69f1---zopapatuvakuxipenodam.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b1f74fe49---lumevififuxawad.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/93512232071.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/rasimuzip.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/visilepibafawexokajalozul.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/7529155803.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071addd69529---29076210764.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/fazidunegonovuduvozixawi.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/miwugomazuramuxutugosexuz.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/mamejadaxim.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/62438815619.pdfIn PDF document text
    • http://bscartridge.com/pic/nolepo.pdfIn PDF document text
    • http://k1a.ru/images/files/file/sulapudafutipofove.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e8d58dae3---36903468183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=exercice+de+math+3eme+fonction+lin%C3%A9airePDF 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_off0000bdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 10984 bytes
SHA-256: 8f43a0e17dcff88560c4ab3b32a610d6b35e841a50845c0ac7e31fec0b7fa140
font_02_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 16800 bytes
SHA-256: 575e53bd2d1ed7bbe2c8963aaaf22c9eca1d7ea4923458794dd85105bc2f95a3

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