Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ead796717c3729…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 17:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3db897b660f5123ae35fd6db764ed94f SHA-1: 778585e18f05972026344002d9fab8a74e1aa5cb SHA-256: a5ead796717c372948e38f6dd08c428316517fbe83c951f075f9dbca642773a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://intproplaw.com/admin/uploads/file/bofanet.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d25385141---fokuxisigukojulemi.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/74974745560.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/39550917278.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8817e4824c---31475405058.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bce4cff91---molusalejewobe.pdfIn PDF document text
    • https://negaratoto.com/contents/files/47765204917.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/takusos.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/79963698418.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/62940892934.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/7051232785.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/d7c957a0a173f89c6db19c207cb55410/29604483684.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/50509218700.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/80868722563.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/neminasogaxukubutivaradar.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c335f03f2fdc5053243fd3945db3fc32/daxoxurevenilazirogusefod.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/97305514870.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1fdb78292---42036274877.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/16653320924.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/97567173507.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/wufekixunar.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3859d1d2b96160e8f794a7df889fb9a8/33725411884.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/1963087533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=poor+economics+pdf+drivePDF 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_off0000c5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B6 10540 bytes
SHA-256: 1e2b4179cdd08fe7ed610b4af7bfa6117d8ceb61571e709fc24734edb659297b
font_01_sfnt_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 16360 bytes
SHA-256: 73d8e6cead3c084155cd4d6f1d3938d6b9e03f425354eef29ab516cceb0567a8
font_02_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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