Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3dd418be328699…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 19:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef52e33a4dadcb088e812fa56d73c588 SHA-1: e0a3da8a6a8cf9b663576e38c8ebee9941294fae SHA-256: ad3dd418be328699f3607cfdecfc1266fca46897b470bfa5e654094c4e9af311
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. 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 http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071857eb7cf5---vubeperelibo.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/45hrckfq2hj9oilfgvdn1cp30t/1090380151.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/69972537416.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ikcvjl1m3mf9mj5l76md1a9f6l/viganazafole.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dumowokizuriw.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/ginozonabonokuzizilotuj.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/bedag.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/vibotu.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/kiluxafozapeno.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87255d1a86---56908877254.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210907/210907004729123722ys1hrnba0ihv.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tpl44p77s2sl5j0iveh5jjadvu/76634312775.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120c3562c28a---fozolegubojozuvopapiju.pdfIn PDF document text
    • https://manenshop.com/upload/files/74200454009.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/rokiketulegefo.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/40a844956037905b3b9cd3487f434464/85598779066.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f89a2f20a66a3cf1dc26f56b27adb77a/zefutabuvafoluwemamadu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/47519100359.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/036e55679bd278ca63b8bfe84d887766/kubesatokipubiba.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/9944172098.pdfIn PDF document text
    • https://silga.ca/userfiles/file/zovedoxofotoda.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/rakix.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2d9ce27fed681e012a34fed2655729e/22077597845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=continente+de+asia+pdfPDF 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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 19260 bytes
SHA-256: c60635b4027a4216a33150786766ceaf587d0d4fa21b94c83800dfbdbb436b6d
font_01_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D4 10376 bytes
SHA-256: 2c8ee67dea1fae09b014d17e5f18e15bf66bce7f68ce5e2ceefdd1c3fcb4c003

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