Malicious PDF — malware analysis report

Static analysis result for SHA-256 5125d31c497226f4…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 20:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5de5aa4ec627867cef2ccd7b5b1ec447 SHA-1: da8038895c13c0356aa395c8edd1b3e74cfba51c SHA-256: 5125d31c497226f470835b94744f53bdc17580f154900e42b25b330c0c1314ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs like 'robux+for+free+no+scam' indicate a deceptive purpose. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or scam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=robux+for+free+no+scam PDF link annotation
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc56f2e5d---puvog.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/91016643501.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/gagumakunaz.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/dexaseda.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/maxowusizemimiwutoso.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/ridotajamesevesir.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/bb7e1ab4b246acc0a4b21aaea7baeebd/33277879894.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/novufitepoduko.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/maragogiwuduzo.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/53742583629.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/53291183907.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e06b4c709---bufuvafamevuvomipakire.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/14445558485.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/54236051978.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161358628a6b51---39343705602.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/15736281065.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/lifediwe.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/62699185659.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ef0e8a356157810830e36eafd8493094/37652125674.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/duvugugefidebofapika.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109180712523368.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/karakegulidozatemip.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_off0000b8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D5 15424 bytes
SHA-256: ff4560996510e3299dad11fae947941149e8b713eeadd572e560fed38cac1d38
font_01_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 10648 bytes
SHA-256: 36925d8b8b94aa28da8a466274fe2bebe7b53693f7c0fe3c48330460fd878672

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