Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99e274713d38b5a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 19:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5deed8359401fbf6197bbd0e85e8632d SHA-1: d5f7435589c86db06fcf45c0de870d567bededf7 SHA-256: f99e274713d38b5a1819e29845cf0a7c201c26bbf60b14414e74cf7c343b9c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5815

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://ketchas.ru/uplcv?utm_term=close+corporations+act+pdf PDF link annotation
    • http://alrehabourhome.com/userfiles/files/53200648686.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6c86070664ef5b2ab68bb9f113ba5438/wuwevuxefibun.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/55496839626.pdfIn PDF document text
    • http://hydrem.ru/images/file/75475997169.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/56159247395.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc86a8c360---85515968318.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/53be585ab91375566b8341076afcca51/mosobopijaragub.pdfIn PDF document text
    • https://coil.hk/upload/files/gigimaxaf.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608002be6d00c---3495032664.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/408bt8mthk84g13de0mot0h9ln/wigekotubizibilivob.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210620014945_8stdkv.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16239987827442.pdfIn PDF document text
    • http://mariancozma.com/_user/file/tiniw.pdfIn PDF document text
    • https://campermagazine.tv/public/file/32838962150.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/43805033330.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a397003b9b0---bapamemodaximuko.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160786bd797db8---62498732558.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f47f703ff221e6e06c1f520203d8fcae/2628258385.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089b138dd642---gixijepenekomipemusixiwub.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/1746005576.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cdc806217---supewegin.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/wulujaxoxevajul.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161173392c77a7---zudefovarovo.pdfIn 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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 17604 bytes
SHA-256: 3be734b6f43419c9ecb810e0723926a45328228917fd2dad28313f30b506f286
font_02_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 10644 bytes
SHA-256: 29ff00cab17c50ab61cda511c4be890dce93495653e51149e64fdebddbc07f7e