Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16d0ca5b57f50db…

MALICIOUS

PDF

89.1 KB Created: 2021-09-23 18:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 899c3579d1a2c0a8ea703fa2b2d2f1d4 SHA-1: 3415263d035490d10dd933fd61aa13b1050033d1 SHA-256: d16d0ca5b57f50db4b49351972d3f0b9f228009ee83f9a2512eb7e09e1dd67b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs suggests an attempt to redirect users to malicious content, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4621c9b40---46143025420.pdf In PDF document text
    • https://duragloss.pl/userfiles/file/54343306513.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/lepatopifibukotomij.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/37111049436.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/gukaxoresibexogu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ps383j1go1cgsbu34kll2bjeb7/88894634166.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/60401510216.pdfIn PDF document text
    • http://speckrepej.com/upload/file/gaxogafened.pdfIn PDF document text
    • http://hadt.vn/upload/files/85689349729.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/kasuxut.pdfIn PDF document text
    • http://esistore.be/userfiles/file/ruwerutifamamabimulelu.pdfIn PDF document text
    • http://cochemical.com/upload/files/32987554365.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lous735jkhdi0cnvfq1g6v5l0j/pegivefamigewomupiwamil.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416169babac---68300698556.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161498999be4f3---kuwunabowaxegaxozekupod.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/lolajowikox.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/232584629613f208df327e.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/56079151058.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c0c85626ec070d55e2dd3c84e58e02a/nunojabedofujubas.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/42563709594.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109081130111525.pdfIn PDF document text
    • http://altinay-law.com/images/file/vipiluwenijanoniwojap.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/mufuvazanevetelija.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/wopitititunudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+unity+beta+apkPDF 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_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 17220 bytes
SHA-256: 0238592b61d837d6a5daa47c95ba35080a035c19e55e58f0b10ab2fcb2001871
font_01_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 10432 bytes
SHA-256: 26464e49832bca0eaec2e22f27d4c8b3602245b8c2eabb1fcbfacd6f5c8f6a5d
font_02_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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