Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc3ddca9c742711…

MALICIOUS

PDF

69.8 KB Created: 2021-09-21 01:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a7d1e781e075301c64ab1cde1ffbb6e SHA-1: 93d8d32c2112d598f821fc85ed3ae2d2ebe36405 SHA-256: 5cc3ddca9c7427114f79ee6e532d29765ffee2d571de186e3eafc7164aa214dc
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/barizuremilebokuzigojata.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613245de91d2c---javojidixowadu.pdfIn PDF document text
    • http://ymmicro.com/files/files/10345993019.pdfIn PDF document text
    • https://mattress-leader.com/media/54109017783.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/21167312291.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a1a436e3559c8c5d6bd15d37bb588db9/jafopeguvaxes.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/3310778182.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/sorobok.pdfIn PDF document text
    • https://alev.az/userfiles/file/vosuvesozepeza.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/lazejobop.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/vonufobejumoxadiparuxeje.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e292cdb8d---97846548565.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f50d1503dc1693749e924fe23abcb2d0/xaxugovasivutibo.pdfIn PDF document text
    • https://rotitelor.com/contents/files/63505022834.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614178612d47b---nekubanuvari.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/37655230030.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/79159081859.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/53ab59451435f047164b60992059a004/moligebog.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/63812803708.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/gakixegijeludonevibewax.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/90778460548.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/wikesufogipemutapofobora.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/39409917815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mortal+kombat+11+android+game+downloadPDF 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_off0000af1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1D 15892 bytes
SHA-256: 9ca453f6a2663868827c6122cddd03de26fdc2e64879582021450fd7836f571a
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10788 bytes
SHA-256: cb0c35860ebe8907c46b370b1ae3d410975d25e736a8d03dbfe5aad3d3810c15
font_02_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1