Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3563b1d3c6bbdb…

MALICIOUS

PDF

88.8 KB Created: 2021-09-20 01:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d3d3536c9f9f66093a96ced03431d04 SHA-1: 176d2679f1ea373499cd8ac53d4e6344f932f0e6 SHA-256: fc3563b1d3c6bbdb976ba11bcb7b4807fc5705cb31fb93adddf3a4972183a22e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URL analysis confirm a link farm designed to lead users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://morganmethod.com/ci/userfiles/files/dapuxinokevomogizususajig.pdf In PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/13990294598.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/bojewapur.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/zaxupakuvilup.pdfIn PDF document text
    • https://gdaniec.com/upload/files/65381240907.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/rosolivurelatalikasuzuten.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9e6bbe8de4ba1a030153b4482bd67017/nonazefubodewoxugiv.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/bimuvexaluvolufa.pdfIn PDF document text
    • http://dogable.de/userfiles/file/wajizareju.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/pegaxuvasodole.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/tasezekegokurejovezofus.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/45822989897.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36659830420.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/tubolaxima.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/wopezexatixe.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/flo868hoirvei8cs1l2npk4aeu/88576421330.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/zovusegajademaxewopo.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/77341305700.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/89239717107.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/ridijepipiwanugozuleput.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/rememetupotimazomeniti.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/80181728196.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3928a9a759e7a73c7066832229604a82/58880778775.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/69196424236.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/sewabotuvupanaxuzerotexap.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/lokilosewapimifomodilino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+app+to+learn+java+freePDF 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_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 10508 bytes
SHA-256: 09389513eed6f4913b5358b54f30fbd03074ff51d9ba93fbba3968f171819b14
font_02_sfnt_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 19004 bytes
SHA-256: 7b625e7f898546c34c3b34bfe868cc205e223fe7000e67ce7517632054ec0f0f

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