Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4c50e69664789b…

MALICIOUS

PDF

82.0 KB Created: 2021-08-24 21:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 49ccbf41dffa19c9b69ae5edec8e0b80 SHA-1: 9defc8825f73589cf0cd921e34f89a72304878e5 SHA-256: 2f4c50e69664789bd9a599b97d39aa4a0895c05b8534ed79b77ec897201b2aaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=subject+verb+concord+definition PDF link annotation
    • http://kco.su/userfiles/file/xejovux.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/94514705552.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/74661163155.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/41174303075.pdfIn PDF document text
    • http://e-district.org/userfiles/file/kisofilukulesipas.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d85848d5b---15416424301.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/89617953737.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3cfa438d---11527660484.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160863c4ab6221---18005581329.pdfIn PDF document text
    • http://susutour.com/userfile/file/kozoruzuwoxaw.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a3601e6c---17881602759.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d3df84737f4acf8c76d9eca63ef7d60b/liloju.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c87eba66eb133bc9c77098b6e7e43041/91878779894.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/92641114454.pdfIn PDF document text
    • https://agatanorek.com/files/file/vepebov.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/fizopode.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/tomorojimitij.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a092510956b---bamepowuwojudebimojezavir.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9a89ee588---sipagimipegividi.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xovevisir.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/18477067469.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/zovifofawolazegajuwufanu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/eca29a285e08ede953bb4d087259c1d9/75999934310.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/pukewidojibexaxamanin.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/4581649626.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_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 10604 bytes
SHA-256: f060c5c18cf09560072e59afcf06522de8209395717d4620d671950b7920adc9
font_01_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 16724 bytes
SHA-256: 4e9c0a6830f2197cc8ec31a1e8587cdca55ebcc7f317fb3c4e37657fcd991210
font_02_sfnt_off00012244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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