Malicious PDF — malware analysis report

Static analysis result for SHA-256 28168ce9d936499b…

MALICIOUS

PDF

102.2 KB Created: 2021-09-04 18:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 596095c95971e2232f2e538656859821 SHA-1: 9259e51bda247a48c8c3c08caef2318322e4ffba SHA-256: 28168ce9d936499b6a71089ea6648ea9508644362f3905b31bf0ec26bc9cba8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a strong likelihood of this document being used for phishing or distributing further malware. No scripts were extracted, but the document structure and URL patterns are indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tragiaocolamsapa.com/userfiles/image/file/pobigigem.pdf In PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/da4f8f6fbfa82f9081752f790cf6145e/82446392772.pdfIn PDF document text
    • http://tw-go.org/files/duxud.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8be6c7e180e55c813d7007348c4778dd/goxawapilenake.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/66194924999.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/levin.pdfIn PDF document text
    • http://karapinler.com/calisma2/files/uploads/38754576765.pdfIn PDF document text
    • http://olympusflights.com/files/files/tutazem.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/jumitaxo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/siwuwutuxir.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/vesenonotuluvakone.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/859d108efccb63af4f499c3ec8f339a8/vidabev.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/bogibivuzexusuno.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/dekelinego.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/buvupadinowagevalo.pdfIn PDF document text
    • https://5uempat.com/contents//files/jodusosoxegudum.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210712_25F3156A38AB05FF.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d240a0a87d---88862388074.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609097776e029---81626934528.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd4a6b8552---71550303066.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hdvloel05g3e9iq6rp6klelec0/xifowamizitugodegola.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/1246644877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kitchenaid+food+processor+manual+kfp600PDF 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_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3D 11360 bytes
SHA-256: f1d981f4c20a58f2a89b4b5dda70a61e432d9ef392d7ad52a660f9365acc2cd4
font_02_sfnt_off000159be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BE 18116 bytes
SHA-256: eb1d6ddde7926cbba7985c67eaa1a750eb449f7a756beaa355450c2277d0cea6

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