Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3066760dc2fa010…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 14:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 343b3e793962389f398cc46a6c0eef86 SHA-1: d31c07ef68ba7c5239629738a0c9ab5d0dac83b6 SHA-256: b3066760dc2fa0102644706608d70059fab824d07441bd24699da1136fc44b40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mytopics.it/uploads/file/fazimujunugowen.pdf In PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/76962689438.pdfIn PDF document text
    • https://subarini.ro/mm/file/94943263168.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/jizip.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/5374678257.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/putewebifabezesipuxita.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/teliz.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/juwujobijapomoxe.pdfIn PDF document text
    • http://adveotec.com/img/file/zasuxo.pdfIn PDF document text
    • https://viceda.com/userfiles/file/rerozixolu.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/lh1bmt91fl7mod5rt4nq9rp2ll/5666006596.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/tajuledovexu.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/35897697660.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/gifipaxirevubabumazezipa.pdfIn PDF document text
    • http://balone.net/_upload/file///kepukuneziloniwafawo.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4e3c7b010c7a9a6f85b47c122ecb0296/kivejejapu.pdfIn PDF document text
    • http://ledson.ru/upload_picture/tubuxemev.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2909aa53---fukojizuwejasu.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/ladesumogaboged.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/gdr80fbcev5ll6rpg02o6vk65j/66964144779.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/53096032211.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/32952162170.pdfIn PDF document text
    • https://austarpharma.com/upload/files/85343049832.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612b580c29b62---gomilebokavikezisik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=blw+alimenta%C3%A7%C3%A3o+pdfPDF 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_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 19788 bytes
SHA-256: 4d8620ed416c8e7e142fe300c7058c082e9fb27f85d39cc8ea275be6ac89a140
font_02_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 10992 bytes
SHA-256: 604df4ca0510771d67f8d29812234f31ac1798ae5115aa342b9a36c6e7a0e56c

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