Malicious PDF — malware analysis report

Static analysis result for SHA-256 24962eb568d25b0f…

MALICIOUS

PDF

85.4 KB Created: 2021-07-13 19:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 355f1c780e79f02d58a5eb6f57055aee SHA-1: 128f1ae28e910fa60a261da92c87e5dbe71a235b SHA-256: 24962eb568d25b0fbd13347ce8e1d7405ab74126dd26997ed2a1ada300e97580
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=do+students+get+taxed PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d6913f00---nejowosomepalabatobulizul.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08705c106---fezabuwifuzobekap.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/pavunarinaz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ded6f663f5---gedenuromanojo.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1cdbcddb18aea60cf1ea746d768a4d68/zakibulefidukov.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/geruxenuvoradod.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/69398493752.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/13194338747.pdfIn PDF document text
    • http://omni-links.com/loxoregaridulojef.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8b195qtsligm03g86foii6gksv/24553351960.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/88620203537.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/54510101670.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9umlr84ldvlu5m7jli44drr486/76020304508.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd0ce2dd5---6925945755.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/shhihd88321n5dsmdciuolt1u7/1717965650.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/59226487249.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6bc3079c1a88b52b18782a93356d868f/febifopabafiguluv.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/85041703522.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/08e2262b27a565181b9200a1af1e4d8a/loxepumadonojina.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9gr2u6mrrb6otg113kipnf98ms/tefuxakelexuwubisavaka.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2e11afcc9ccbe7ce2ae1f5aeb3ac0863/kuxod.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_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 17104 bytes
SHA-256: 7a44a6a79cf7c559433b4cd8b4165118e84d42d7197e18eec68d021b69a385b4
font_01_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 10388 bytes
SHA-256: 703ac121c0b970bf3c9a945513641e3467d7dc04db3505c21d8cfb8ddac7e547
font_02_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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