Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c05792e848d7ff5…

MALICIOUS

PDF

74.8 KB Created: 2021-08-16 20:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5156722a7c37e965568ecf223195438 SHA-1: 4d5bc6db4228ca40ff849d0db76bbe681f2ea029 SHA-256: 8c05792e848d7ff5453285ce8c512043829ab5acffcb38a1a477599eed480e29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. This is indicative of SEO manipulation or a distribution point for further malicious activity. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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 https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hmvvmks5gq5cdsdp2jghg0bk1k/75272164194.pdf In PDF document text
    • http://poltinka.ru/userfiles/file/28966340792.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b694c1f2a3---43726129115.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a728212f---poxulikevel.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/potosotisad.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/sulopofavuwule.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d2cb3a445---61284063842.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/59628099076.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/afq99lrbsnj853o74qg6h90116/wezepujopuxifamozam.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/76723665290.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5a30ec2398b5566ec05168d5cb510cb6/musov.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/84288173528.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f581001b6d---56822738100.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/fufuvogofomofuli.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d9854de04---fipamajezejatirazun.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/bae4313954836df50552faf776427117/milaku.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/82488961381.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a5386b59c---sekiramosebinejirerazitad.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf72f3a7e8---zefunun.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/vijogulikivizote.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c57fd0410---waripagujuromefusutobape.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a899dfc8bcf---2618126966.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ll9vnme06qu5ec892faa7i8ajk/11535289130.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a540fb9b---99624562038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+vape+pen+for+cbd+ukPDF 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_off0000c0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 10928 bytes
SHA-256: bed15a85e3f015b6502ac14b0a32b8e7c574f27a40e950d4926889e789aa49c5
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 16708 bytes
SHA-256: e7aa6bc2f0218a13a47a2d68b655163980ea07daaefabf61dd18df77f306de11

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