Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe3989adecb7f54…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 02:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98f0ca34b18e7315dab9229711c4ba1f SHA-1: 4d04242e4380ec4df3ffdbb6658ffbfb728125ef SHA-256: 7fe3989adecb7f548a84405ed63215e28868269114b43b51e0b03add5acce620
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of a link farm is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ekorepetycje.eu/Upload/file/xeraforepimusaxuvef.pdf In PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/sifuzipebotekorat.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/wolaf.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/refinodatibavutewopotenos.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109011424314597.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c730d6ae---43273283210.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9882cc308---18204982729.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/jedagumexek.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb6077ab2---81076742391.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/gevebikigijalanol.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/refumonekotu.pdfIn PDF document text
    • https://orrizon.ru/images/file/52062405289.pdfIn PDF document text
    • https://adikkedua.com/contents/files/18178105770.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/talovimade.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/42008989422.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/59250667247.pdfIn PDF document text
    • http://happy-land.hu/editor_up/bifigupegemilos.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/53239145995.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/radadixi.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/dukigewufemejezib.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/3866032549.pdfIn PDF document text
    • http://idcla.net/upload/files/94575100361.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/88733156025.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/dcee3b6777743a1df177abfa4b103e2c/73717346738.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/jewovawefepokumaxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+free+m3u+%26+m3u8+iptv+playlist+for+vlc+%26+android+appPDF 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_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 17892 bytes
SHA-256: 08e468bba9f7ab085f0d5a40d7b0598a011438097e83b2be38435353e96a12de
font_01_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 10516 bytes
SHA-256: d2e66973f4a82302b1beb3a488f3f34d8d100fcdb10398b60c5df81a1606ef12
font_02_sfnt_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1