Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca24926b98e0c4f…

MALICIOUS

PDF

81.6 KB Created: 2021-08-20 14:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 576342ca28fb0dcf31db3573f62ad56a SHA-1: 5543926c057142b2f9b456ff03dbda3f52fcdcc8 SHA-256: 3ca24926b98e0c4fb4634cdd0d962182dfd89f64c982f69c38ed36293f9ca7e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://inwebjor.ru/uplcv?utm_term=ishq+mein+marjawan+2+title+song+download+mp3+pagalworld PDF link annotation
    • http://newtarrytowndeli.com/uploads/files/vobelavajivugo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/hsmvkh76dcelvvc76mc05sefvm/wutotojixul.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/xuzobugozabekexexi.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/21043615495.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c32fd67d3---fexuwosorijisif.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/tevojuxawa.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b3a5d1c3c97103cfbec4b3f97f75111e/36625191062.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/34174697676.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/libilabegepaxo.pdfIn PDF document text
    • https://nomortiga.com/contents//files/vujogizigagijuti.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/43726774732.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/nabapugam.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f1ac299720c182415470c145ee920f4a/90722120277.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/24130255649.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0eb925f69---20935810476.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/34a763cdbee6701d369b0ae2a3416053/sigataduzo.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/bilovafudijolidobakupazu.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rifaletadalilelexubav.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/27565513772.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/65345647413.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fukivep.pdfIn PDF document text
    • http://iltorg.ru/upload/file/67094694329.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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 11444 bytes
SHA-256: dab42cccede9c42e5845572f81dc7ebdae366d9f95cce3026e2043ab00c9826c
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 17752 bytes
SHA-256: f25aff8aa7cbd075550ea70aed79c10db5b8b0cb39d9a1a8a056d59907e6adf9

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