Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c9201b27ff602d…

MALICIOUS

PDF

77.1 KB Created: 2021-10-04 19:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3bdf0e5a52f6ed3e8bca6a6aa053267b SHA-1: 1ab1f7f1928f35c2d6885ce08f6f43cf8d5cf702 SHA-256: 85c9201b27ff602d9a2887c6c596490e4658b0c05711270b8847c7929d8a2ac8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://taechoclub.com/FileData/ckfinder/files/20210901_F551EE726357D1B0.pdf In PDF document text
    • https://5of7edwardstreet.com/assets/media/files/61770552618.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/posarafadajukedebuparow.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/30167144362.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/xifagixofamimufaxav.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/26429325839.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/wezaliwuvumaximexazozozu.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/tinamedojakotesafesuju.pdfIn PDF document text
    • https://hiroyoung.com/data/files/vowebiboxovukexa.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/tilam.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/xelogababazafivawigaf.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/52163062966.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/xeburo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/aac8d18dc82b0875576d3a8d18c487db/88965438592.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/57541139077.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090418035970554.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161532f92b7818---88014276650.pdfIn PDF document text
    • https://wsbtitan.com/images/file/14980769961.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20211003235757.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/9005428343.pdfIn PDF document text
    • http://househouse.it/userfiles/files/60617742506.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/8709335159.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/dafowofutuforifamowove.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a20e43532---88550578003.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/lupedorekas.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/redenusemeramuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=computer+organization+and+design+4th+edition+solutions+pdfPDF 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_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 17640 bytes
SHA-256: 15a46bdf53beec2cd4c37db6c9a84b288ca622bd8cf18f91179f7781ccafdb25
font_02_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 11212 bytes
SHA-256: 8340d263674dce8ecef7541375c1ab6ff84ed446dfc3d86e1f527e527a3a2c15

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