Malicious PDF — malware analysis report

Static analysis result for SHA-256 2786ff4756c5b158…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 00:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae01a4bf85f3ab2861553d2be7529a54 SHA-1: b803d6c0ee7314e6975ced968b33bfc991970849 SHA-256: 2786ff4756c5b158c839cf09bf246a2d71c183cc0e612964ddb12bb7cc50f436
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ou-ravda.com/ckfinder/userfiles/files/43781431168.pdf In PDF document text
    • http://getdol.com/page_data/file/tujebovusigisamux.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/powosufidakuber.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/nimefevonanosufuwaxug.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425f13420b7---genuxo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef98cc3dd6---19010359837.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/memolivenuso.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/92770310956.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e0f045d291ff82e7b3d3f39ab17a4f1a/lozixuvuru.pdfIn PDF document text
    • https://ksboutlet.com/file/files/gebuxatoxugib.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/72964247042.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161320fb10d059---71851012759.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/69820821478.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/68180546085.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613359a8038f5---68403850547.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/mugasimoxojanivewomid.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/gepopukasulup.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/97255329221.pdfIn PDF document text
    • http://uco-kampen.com/media/files/nubojolemaninedojijal.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5dbf0fdde62e0f6c1536cf6669823d15/bedala.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/67495943314.pdfIn PDF document text
    • http://risme.vn/files/xofuzidifoma.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/bawunupezenekazuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=deep+scan+android+phonePDF 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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 17364 bytes
SHA-256: 575777cad1ecda71bb72748718e271b395f96c635a0e1faf55805fde381cbcf7
font_02_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 10468 bytes
SHA-256: 4adec10641f0bcfa767e3a87f0d44bb79cfe72dd31f8d0174b41462b6b71b10c

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