Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdcdc62e2c615bf…

MALICIOUS

PDF

85.8 KB Created: 2021-07-05 19:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 77f00bc2ec40f535c3d264d128341725 SHA-1: 6b23d7684c8dbb88411a4a275cfe421131b590e8 SHA-256: bfdcdc62e2c615bfac0afa4e90335cec1e3e276757cfd76002e16b0e54c672a2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mistralizmiryonetim.com/uploads/file/lolupefidutuvamozasu.pdf In PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5c9d07ebe5766cbab352e332e7d876bf/numawosenukuv.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/bodudafoluwufagajokebazo.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/tawukufofov.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/divm0meml80r747lsa544pm27u/24419814932.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ccabdf703---71891917242.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/todajabunokolafikifup.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3aaqks7mrf68lt13majt49j4i3/fetajeselemewaditoguwi.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/3050070313.pdfIn PDF document text
    • https://masihpt1.com/contents//files/fiboziludasek.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a17dbd7bbcd---sazafalugijokab.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a776d07554a---senawejomorapogap.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ddhj50lffnu4g1nflkgsatpfnk/26311486296.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/oft79md2vq1ucgbj1l36k2u9u0/tapufokaraponozep.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/fenuruzujajerelomupunawi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a4eaf445ef55273ab0deb1553a65f50b/nobur.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/vusasusawarujelixamanana.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/zikivisosalibasenojiraf.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543927f5ef---46848944672.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2a2e5cbd1b00fb4147f288542851530b/1535183525.pdfIn PDF document text
    • http://esistore.de/userfiles/file/jumegamipiji.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085edc7e624b---bawomixiforurize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=increasing+size+periodic+tablePDF 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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 16704 bytes
SHA-256: 7d1a54b6cea2282c42abbd98e9b9512fecc8b195b9025a7bb0a229b07055151e
font_01_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 10840 bytes
SHA-256: 01cdd656717432cefcd2317f6f91274974da617c0d9ba360d861aaf3be4abd06
font_02_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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