Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75ac083527f88c3…

MALICIOUS

PDF

89.2 KB Created: 2021-07-25 09:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf6fc1509c289a837f4559c91139e67a SHA-1: db63d67b20d5264661360d02cfb789707bb74a81 SHA-256: c75ac083527f88c34e420501298de1a3bfd097e4ccb98b23ae9f9115f65310c6
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/60769a48bd41606942cd89e91c35aa0a/33881238115.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/kedijo.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9f819d5854afc7ffa2fd413a33bcf427/86157820743.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d29fdf30a5d18c2ddd9c5775446c0562/pakusipir.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8hidn30n7op3cjrepvfls70399/besuzaba.pdf
    • http://jpind.pl/userfiles/file/zorodemexikiluwazufe.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc14e5dfb---fojikewizatesi.pdf
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/92737745447.pdf
    • http://cheapmarkt.com/userfiles/file/fumovepelilore.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b520023622---xipalijawaxarepeworagil.pdf
    • http://ranjitabiswas.com/userfiles/files/48018435576.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4973dd3315---puwokodobozome.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ac53b7376c5501947ef2e19c6142c4fd/47451664401.pdf
    • https://vsetinrally.cz/userfiles/file/98821769679.pdf
    • https://aartipalette.com/userfiles/file/zudefufokimatazimipow.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c93f8fbc4---najatolimed.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/768adea9d5b81d6ab01eabafa24c3de2/netita.pdf
    • http://dermaktif.com/imgup/file/joroxosilakivukazojewiku.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/255d3d78e38b544cdd9f413cb89d3a49/jotifowi.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cb72de7a3a04c2279398cf1f9ba81cc3/kavupovejixeretuluvido.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/ribovavunotudepar.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/86867616427.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd50823034---35345738738.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e8fadb54---64662509249.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/fivagasinitixamep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tommee+tippee+bottle+warmer+instructions+pump+and+go
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f269.bin
93331504850b73df1334a6bb16e741317afa490f535e15dc89b702ba2f75a56a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 11148 bytes
font_01_sfnt_off00010c09.bin
52d11da82e7d89441d70c710db0957cb70c101d573dc2236784ea75a73e1575a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 18272 bytes
font_02_sfnt_off00013c9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9A 16792 bytes