Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3ff8c7ac37e5bf…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 16:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69faa74f2a6bd87a23d5cb5b6c0e76e1 SHA-1: 02e718c04815b1c0457134acb87beb9628fff8db SHA-256: bc3ff8c7ac37e5bfa375145d4cf74e95001b9e260a9801491a822988a612a036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, likely intended to lure users into phishing scams or download further malware. No scripts were extracted from this sample, but the extensive use of external links suggests a primary function of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=how+to+transfer+photos+from+an+android+phone+to+a+laptop PDF link annotation
    • https://argentinaproduct.com/ckfinder/userfiles/files/59641118595.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/84251570832.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/fomidaxapesudojewi.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/45901938032.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe33f1c542---42760632254.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e177ae6a58---vupilufarapu.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/bipijutudad.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/39633442605.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/12192442601.pdfIn PDF document text
    • https://led7.ru/file/73683026984.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/gosiwa.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/18448279958.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d58d2c53---dulipaganilovikotif.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/24529522822.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/38840067688.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355779603e3---diwibudufi.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210904235042.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/vejafatokofuxa.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ae336af019be58ebaeae4de6d0034a95/13114923488.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/tapamexi.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/kofizirurexuxenuvojozon.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vuturalokedalixulus.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161458eee7f05e---50891790851.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_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 10840 bytes
SHA-256: b3195f278c4715236d9688d93f41ec1972572427417d0449d2f16cd516ac2868
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 17648 bytes
SHA-256: 303fa88ab5b323bc7901093d159c090dd30a3598ef8378d89c6434c16ce33c84
font_02_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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