Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53097374e7932a8…

MALICIOUS

PDF

89.3 KB Created: 2021-09-06 00:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bda51480effe5db475ffe2bf718c767f SHA-1: a003b9c64f34ba4452f914a72040810471227960 SHA-256: b53097374e7932a8f8bc561eb3015a489b545cdb700b8f9545d8560626aadd81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of external URIs and the overall structure suggest an attempt to lure users to potentially malicious sites, likely for phishing or malware distribution.

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://pistant.ru/uplcv?utm_term=taylorkayteee+workout+guide+pdf+free PDF link annotation
    • https://cristalparkhotel.com/ckfinder/userfiles/files/15708921351.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc726ebe6---77128705812.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210609_103607.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5cbcbed9512a01ce0722da23ae0990e7/zazakuxepopobumujivazozat.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/piwenujuvodejalilexonepem.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/37508561560.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfeba8dc9---pojozibixetagafitilo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9c04b3c556eb111ea8746f498b494626/57289085786.pdfIn PDF document text
    • http://darec.sk/files/files/47289947849.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/86808440483.pdfIn PDF document text
    • https://blugarden.eu/file/dinus.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/28637699912.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/fibozisexugagilotoreb.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/75082405621.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1b02750d---18748626721.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/47430115008.pdfIn PDF document text
    • https://autoskola-scp.com/files/vifavabikilifogesexafut.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/1723068655.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/34768935104.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/furogetojogu.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/7ce59f8ac8cd2d30e46f8a5982c8ef81/9233435295.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/dugulilus.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/15081699606.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_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 18092 bytes
SHA-256: 304827503e8b65633d074feb88b91311a5be2ba5a22e2d5e4dbee5daa91a24e0
font_01_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 10756 bytes
SHA-256: 8ad5666295b80e396aa744cbbc1e4e45f62976bbee68f33e06d1320813bf6bd6
font_02_sfnt_off00013f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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