Malicious PDF — malware analysis report

Static analysis result for SHA-256 30168515cdc20b24…

MALICIOUS

PDF

87.4 KB Created: 2021-07-28 06:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3329376453416cd7545dd278bb269cf SHA-1: 6d64bf7fd91c4a18459fc16686627f593c8aba95 SHA-256: 30168515cdc20b24be7bde303edb3fca198eb74d7f33c6e3fa2ab98442af80c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e2fcc889847aa6c4bcae31a295e945ae/fopamiwi.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02360d0cb---rolewapu.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/jukefejifexojo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6t1s3uidjlha75m7nsi2aavrjb/6050115855.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/numixomebetezejufepe.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69f6f14cc---baxid.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/41d8dfe5908a39636e72a2d28afd6836/51287990426.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/15667968276.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcafec24d01---rewusananup.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/94404185314.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/tilodivorewelisana.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2333bdae54---85066476848.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/73893812157.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/10492929511.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f6098bad---54909082135.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/e1a5ad2e48b7c79003a66e1544f18ab1/97060151202.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/anhueeln73i25auini953o0v92/84778815525.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079c4d4330c4---78725286729.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c437b4365---nujomoxeviferem.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/lijujenulikukujopu.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/bujatu.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/90840147429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=psp+fight+night+round+4PDF 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_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 10616 bytes
SHA-256: 122ddcc29cda2c1b8d507c1ccd002d2a687b5409c95f12d538ba3874e49ad5f2
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 23620 bytes
SHA-256: 5ebf4ecbdfb01b592870c066007518cffc7f160709b44bc35570a978f69b9cbd
font_02_sfnt_off0001365a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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