Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e0a892546087c3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 16:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7783782e43dcebf94e5149e04e8489e3 SHA-1: 8107db8469c42cf597dadfd7f8ba5f8d9ad83ceb SHA-256: d6e0a892546087c3e1b5a46b34c831cf126b830097efcc2d617a7f762fd2f666
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to compromised websites, suggesting an attempt to host and distribute malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, likely to distribute further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cuspsurgeons.com/userfiles/file/97229305487.pdf In PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/80294166669.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/nozikirepirijomejoge.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/94072640475.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/laputodadidozuse.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/feborelejokizepirotex.pdfIn PDF document text
    • http://195exim.com/datas/files/19880937899.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/modewivefap.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/18917573436.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/52681617337.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631079189.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/37291781246.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/30566133676.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ea46f724---48290484505.pdfIn PDF document text
    • https://coil.hk/upload/files/7755074639.pdfIn PDF document text
    • http://salkim.com/userfiles/file/94957316260.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a98705f---bavoraboseruwoduzilez.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/86406816332.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/rokuvusikitilubog.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/manamakeza.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613864e807eda---dukiviseresedijepenak.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/vutiken.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/39059b8a887b1126d507c33ef1b15b86/72291887594.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/loxofajet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=willie+lynch+letter+free+pdf+downloadPDF 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_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 10744 bytes
SHA-256: 785fcf3e733c3fd4563b733be69f097b5c1fa85d0417cb81abf11e28f5f42ce9
font_02_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 18240 bytes
SHA-256: 90a2f52e27326f366cbf2ee4d6fac8592118a412dfe300c1af107ad14eec9389

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