Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ee247a5e578985…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 15:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 559915d2d7a0195f7a3c9a0edcd0b49f SHA-1: 922b66421af19bc13b02440cbbf01b2b533bb005 SHA-256: c9ee247a5e57898594e8dc10a5d18292df05db9e6b98d8f45c4df8ee4bb11f54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The presence of these links suggests an attempt to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted, but the nature of the embedded links and the detection results point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nebovsem.ru/app/webroot/files/files/92872545794.pdf In PDF document text
    • https://essuances.com/ckfinder/userfiles/files/55757480640.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/wiwonoso.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba40d7ee5f---fuxugadukifa.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/8091357312.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xibanas.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/jutovibefifidexapegixi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db05929f9f---tagizexuji.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210914_020759.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/85536860671.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/javirexi.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/sexarisivop.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/walali.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pijipevotixasotosixa.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/rofim.pdfIn PDF document text
    • https://2acontractor.it/images/file/tumudesefowevi.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/fowuwada.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/74373084926.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/velururezufowufem.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/manumobumuzefut.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ce88j1vifvjkhvvm47ljak8mkq/40829257592.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kopitisotowiwo.pdfIn PDF document text
    • http://d-innovation.com/upload/files/83437552989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hentai+3d+game+apkPDF link annotation
    • https://lapdonline.org/file/lasoj.pdfIn PDF document text
    • 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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 10556 bytes
SHA-256: 4b93cb69d4ae5a5a9e6c5a43f7bb80622dc99fe1cc20d6580c7af6456784e2a3
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 18444 bytes
SHA-256: 0e7ff016e4ac462d4bbf08a29572bfa8ca7a8b793d1254d6bcf3bb63f635cd43
font_02_sfnt_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.