Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd398f841107643a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 02:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47621e8eb06d2ece8b328adbeb6e1573 SHA-1: 0f9e4926cf22c1e12d707a0376bb7c960f95fd3b SHA-256: cd398f841107643a5f48e90e67bd3e4fbdbf7e4ef48809c60ed6624d59b9b0a9
176 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 detecting it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised websites and potentially malicious PDF files, suggesting an attempt to distribute malware or conduct phishing. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://philabc.ru/uplcv?utm_term=upsc+agriculture+optional+syllabus+pdf PDF link annotation
    • http://www.arborvitae.cz/ckfinder/userfiles/files/kekupuzafetupevikif.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/lavajotifibatikik.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/89939863356.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/povasagobasosedixebonipog.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/48749145742.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01557ee6eb---wudolodemopikugazefatutu.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/xanigorefesavibup.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/07422d7c73cbbb9a7a9908204c2908a9/70314821758.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/olvorja22t81s1bnmndeqca0kf/52428194855.pdfIn PDF document text
    • http://brlairport.com/images/file/40273849836.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16071e9a6877f5---vikofogod.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/valujevix.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/zomuzaxekotenowenofugozep.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/23358884989.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/takoxe.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1266fd430750dd0e8672f79e31ef5770/89514716685.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c52166ba42---kegubureres.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/wogukupem.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/16847994759.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/7883356737.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f6d01d81ee6cab3e4ba9a33d4584dc84/48917774562.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/43551bf6c97b6912c56b28c231e7d7f0/neminifakofejumetir.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_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 17900 bytes
SHA-256: cfefca7bb33b2965c4b44c694cb61e8b4081a8b05e6bb1cb4272a250c7c9e3e5
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 11156 bytes
SHA-256: bdcf5fb42fc619602fe64b1be890f23b0f4ac26e878a0241a32cca3ee5f9fb49

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