Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9016c13c609d76…

MALICIOUS

PDF

87.1 KB Created: 2021-09-11 03:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be0a2d8542ff3ef89b2b532056e3d8ff SHA-1: aa139f7a128c041930c6166a6ba7ebf67f3e12f8 SHA-256: 6b9016c13c609d76721e95ddd565a0b7a0b308a2c40f2b1f407be7d8102dd4fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories and other potentially untrusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc0fc8152---22924039124.pdf In PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/61207742966.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210904_3F99998CD4E9583F.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/80925297784.pdfIn PDF document text
    • http://chinalabware.es/d/files/lavazupewebewanuje.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4259155e---mujivikijogoriru.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/94585459315.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133268c0ad42---bevinexujemavewuletoru.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/89393010731.pdfIn PDF document text
    • https://blv.by/upload/editor/files/dupowaguwikimezexoxaxemi.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/23748595714.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/75368786827.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67101959472.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/95708613590.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/didasivuwapexe.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/febakasezinovikek.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/41355410594.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed38b67f53---38359357021.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89032791926.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ff6b99cfebb0b001a9540ff8cc3dda0b/31159444042.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/wutonetixidebuxeri.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6b43337f1---xalukakeze.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/10301304574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+fiends+modPDF 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_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 18252 bytes
SHA-256: 65277c40ea9dd2d4485b4e5c94feabd1d5820e9f9965a2c24b4fb94ad2fbc7b9
font_02_sfnt_off00013863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 10260 bytes
SHA-256: bf542d1ff85683b1c7898b2ae7c6272607406d9713ba833c6094e53b6c0c7ffa