Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e18801b1669310e…

MALICIOUS

PDF

86.0 KB Created: 2021-08-21 19:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 274d347528b43325449b0c19835c0d18 SHA-1: 025086ddffcfdbb4098ce21ee787424afeeb6770 SHA-256: 4e18801b1669310ee3e9727d7d62cac688b30cc8c917d978f0579922fd7b9694
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://slbreakingnews.com/ckfinder/userfiles/files/noragebawelenuremagibe.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/v67fqsai9a95baa67mshaq876e/vuxeridumerojezifes.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/qdkfp75pkupr9mdcv3r4hgnp50/54244461096.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/5921756015.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d283f161f35d7e8692a5a9d0e6a259d0/rusuv.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/46462119296.pdfIn PDF document text
    • http://centronegozi.com/public/ritagavabu.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/bikedebomiluxit.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/2978430399.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/95696845037.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/fiwijowulixowox.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/di2ivoq0rsjised5561o355i8b/73974225078.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baba40728cc---nezerutagorurefewavimilo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e3887ba8---pinajavanuj.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/berewumasakoxigolix.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/74449300639.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/26743331548.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/10bd8dc1fa710631282524148796d835/68838674483.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e9ea684cd---79418638038.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/fexar.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/84743776344.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s75jdsi5pge662p65vmetqcal2/ganorekerutibudefaxawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rational+exponents+common+core+algebra+2+homework+answersPDF 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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 11408 bytes
SHA-256: 4e89ff90dacabde571ce7a31e4db4f89b2f95bf41e4415aaec7b8288d5b9c0d4
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 17856 bytes
SHA-256: 9e6bb11d18f2d785eec13ab9c887bbf009320e36d264185670d044ed338615e7
font_02_sfnt_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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