Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a660db21247fc01…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 06:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d929b672256eec12306264deadb0bc9 SHA-1: 21d548c0df958c60b57530b742653183844d7b77 SHA-256: 9a660db21247fc0119c41a752144d8ab38323db0a68e54bfbabd13a4d06badaf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://architettorobertafasola.eu/userfiles/files/tevawuneburoj.pdf In PDF document text
    • http://ge-mak.com/files/jenipotunonikadunuposat.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/metiwefupilixidizupeteju.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/35061414639.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/96433417714.pdfIn PDF document text
    • http://llux.vn/uploads/files/61228548589.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/lifimejojokuro.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/190713449194.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/436843331.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/53754439915.pdfIn PDF document text
    • http://apvn.info/userfiles/file/3866794452.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4cc51377---pozexivukasexitepepabeta.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/49765736566.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/tokuvisojip.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9fcb08267---58626126175.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/m0avcbe2ml2ps3snh7re21qhsi/33303608517.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/baxujipojomukikejiwumaf.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/72124891766.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef306436d4---nilolemikixujefa.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/75059876348.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/33193180862.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/rojorowunidexa.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161466a7a7594a---60005682161.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/getebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=marketing+strategy+journal+pdfPDF 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_off0000c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 15852 bytes
SHA-256: 0171be054e0d7a560dea55f4caa99285a623e021b3285369d5c1c9b830f0af94
font_01_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 11104 bytes
SHA-256: 9c18d2c5925c8a43d5f387f46fc721457cbaca00d75a1acb35dd851dae8286f6

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