Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e5b27b226800db…

MALICIOUS

PDF

90.7 KB Created: 2021-09-19 00:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b62459db8762745ed455d41d1a4652da SHA-1: 1876b4476a7ff613c16e1209c6f19c28b91c6800 SHA-256: 24e5b27b226800dbd4c96a71c67f9dad32258f7d6601136305950a75ea881075
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 with high confidence. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The presence of multiple compromised CMS upload links and disposable hosting further indicates a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://chcial.ru/uplcv?utm_term=the+third+book+of+enoch+pdf PDF link annotation
    • http://nhadatv.com/webroot/img/files/45926540983.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/96808302828.pdfIn PDF document text
    • http://www.centralperdana.com/file/43474036257.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/47920595653.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/pemifalebifuxiro.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/97446365613654b991f0a.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/42867165275.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/ximunofefagupumise.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/79164895254.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/jazobiwodotapudikofujoji.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/kijafetesebupezepela.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/vapavugujuxuzitipus.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zotuxelabatomememubezix.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/38348169208.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/vujuzuv.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/51142453306.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/notinove.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/kawepizezeluzatamexib.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/tubonuborefisali.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5c2aac67---fitodikar.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/58400002931.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614487cd09c8f---4061881012.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/3817319764.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf468ea88---68380219082.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/13460691898.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109161056362061.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_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 21500 bytes
SHA-256: 6eb578aebcf9641c00824595f0e3717edfb40843f051c028f6c99642ad1c5b37
font_01_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 10536 bytes
SHA-256: 6ced905af5b03fbafb0ad16a1bd2dd4891185da9549e71b37b4fc754bc1e6bc4
font_02_sfnt_off000144ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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