Malicious PDF — malware analysis report

Static analysis result for SHA-256 28109e1b2cd3e411…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 10:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 561b039c52e2c46306f8c06b5886fe57 SHA-1: ee7adee3bb1b1a240bdf5c809afd7861c405011b SHA-256: 28109e1b2cd3e4113b71986ef4d9a69b8c965836da40e8fbdc5218a0ec465eaf
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. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=toyota+corolla+gli+2015+price+in+pakistan+manual PDF link annotation
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/11175899235.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e6f305514376575b8609104a0244032b/75094616218.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c70b1abd67ad3a746f4d901ff4dd5314/88844678598.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/26a0e40b38b8644e5b22c58cca278f17/9255774967.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/rolufajenuza.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb88ba3bf---7079715359.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610370aa62980---98001606303.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/nirogikeloloniravimoku.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d4606bd3d6b61604382004a205970885/48011117743.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dufena.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/74597922596.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/sidemefasoxivomamofa.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/16293948332.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd4a247a3---wujodupafuwebuwobupewo.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/13968398198.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/30fac4c5ca8c1d6462a9c5fd46d1dbdc/vuzivekejigolotonimipex.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/99093328033.pdfIn PDF document text
    • https://andhimazhai.com/images/files/xukasoruguzazi.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/jomukezidakadonudotavuloz.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/6429154509.pdfIn PDF document text
    • http://clingac.com/d/files/57970390864.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/70742051301.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772bb525f58---biwupepobafumepojometam.pdfIn PDF document text
    • 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_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 16936 bytes
SHA-256: a9885e394688aba48893140bf5efde513fa6e7e4a7038f9612072fa1428f2511
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 11412 bytes
SHA-256: 9fb99f89aed2dc3603cc2a0745432d3fb1c7746fccbaf408921778814f7f2e1f

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