Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ddf7f551acb8ce…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 03:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0dcada16c786d28d0e91eaa91ee9610 SHA-1: 3bbb86199b3cb6af5d4dd115cb7bc17b82a37c86 SHA-256: 41ddf7f551acb8ceb6123938dfd17bf8c81cd10ec3a5a446c12c0e8267661301
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 link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is a common tactic for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://daedukgs.com/admin/fckeditor/data/file/20210710172345.pdf In PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/jojikezamelatomuzire.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/crbvdiuvffj5kadvujkrn92rt6/juxofariburemifibil.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1e774391---14101297693.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/limozere.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/43648172862.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kokivobazoniwijekusad.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/maradovater.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021725049289611.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a9c6b1ec6c---74920203283.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/xesoritosofozamejixe.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/7009755871.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/lujatupupoxeri.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2a6a85e380c681d511955525011fa647/voxelikuwuxoba.pdfIn PDF document text
    • http://istanajpdua.com/contents/files/suvixotinizati.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad786044dea---vazozeja.pdfIn PDF document text
    • http://hainfelderteich.at/tobolebikarupobusopaxi.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/donogagorubobeteleva.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/62506943802.pdfIn PDF document text
    • http://lawngo.net/fckfiles/11183112467.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/kigenomem.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/00fa2a72fdef604b4a15c8f7b0f7a7e2/lajezatazebaturibeju.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/sakotawedisepepalikevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hydrovane+711+manualPDF 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_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 10424 bytes
SHA-256: 37500b91bfb3879c4c24088e47c6b1a59cc2af30bc457b158dcaff90bbcfa0e6
font_01_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 18668 bytes
SHA-256: f9042e294e4dcc667e9a76758039d9c3e5ffd44b2869dc6210218518a1d1e0d0