Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d740a507c37ac0…

MALICIOUS

PDF

83.0 KB Created: 2021-07-01 23:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1483bd524f3cd9dad76777075526b26 SHA-1: 27a9f267d34035f19f7e17530d79a616428e3afd SHA-256: d4d740a507c37ac0f1d2c36c9a5d2bb89e7c524114fe3fd5ef2510a3503aa339
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://cructi.ru/uplcv?utm_term=temperature+mapping+guidelines+pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/df5e8c9fe362694956b0117162133f54/31530894355.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d3magea4qsla49igclokid99h2/28627683730.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/64944cf6462ee053bf425c8a35693d7d/xerib.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b060772259a---40498084152.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7400c3dd88---31903742779.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e9837b36---juvewexewuvinegudilibem.pdf
    • http://akcjonariusz.com/UserFiles/file/wijija.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/23213887398.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/99559756980.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/boxedegenupiromibosegita.pdf
    • https://dialogueinpraxis.net/files/docs/poparofovadagoloxuweliza.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d3564b8b3aa---zegadavuxemasidiwikal.pdf
    • http://cesishotel.lv/res/wysiwyg/file/bakub.pdf
    • http://stroisvias.ru/userfiles/file/goguxuxejorenanadi.pdf
    • http://voszveszprem.hu/_user/file/pelobazi.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/dqnkq4gngdgfe10mdgt008b59t/29694263132.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bda12dcb11b---loralutifofejetotubop.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/jbsqtq9dda2qf8l1va0g2l9jrj/72110302416.pdf
    • https://ehlibeytalimleri.com/resimler/files/18255720339.pdf
    • http://gleneaglehoa.org/images/file/29853896911.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084122f961f2---25082386118.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbf4b50914---xudojegukixokenux.pdf
    • 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_off0000e2d6.bin
1d5589a94ba7ce39a0eb4500759bbf913889e98665df853e6eda6ae6c2a0cede
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 10784 bytes
font_01_sfnt_off0000fb5f.bin
c93d60c8b7b962eab5ee4b218c5fb23532efe9acc35d6875f8bee134e4bf9286
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 16728 bytes
font_02_sfnt_off000126d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 16792 bytes