Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc21289ae08b4bc0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 22:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1a1d4324eda127279fd548699ef478c SHA-1: cfbd76be9c27b1ee682ab692a4711ac9b61f26ba SHA-256: bc21289ae08b4bc0dda9cb552cbb8d52880e118a397c86182f5ee9b237d82cef
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bluetact.com/locktactyuma/userfiles/file/dabiriselewipakaguwituz.pdf In PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/gowadujasabedimigasapi.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/pidemabipusiwedariduruk.pdfIn PDF document text
    • https://chineseclothingonline.com/File/pumudababatuzi.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/672194447.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/15680398113.pdfIn PDF document text
    • https://betsin.org/userfiles/files/77261592616.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/14520761759.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/jetikirarogakavizasekux.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/zarokabowitotevovipovozij.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c08425106e---wizerotulixadimepofe.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486acef09b7---55868221809.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/81107090158.pdfIn PDF document text
    • http://netflor.pl/upload/File/66568225094.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pivewifaxozomimogag.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631001958.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/56385432999.pdfIn PDF document text
    • https://steammining.com/userfiles/file/18757806680.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/18558854861.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/valanefemopofujo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f5c28a0e3e816fdb528ccd8a853db9ed/gekitowupudeliraselul.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/venegosumalotexi.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zileb.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/wekupeputupibutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+robux+generator+with+passwordPDF 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_off0000b269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA80 11028 bytes
SHA-256: da2464187ab90db30fa7a71b020bed6c1247128e41498d30555672f50504a2b1
font_02_sfnt_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 14924 bytes
SHA-256: 7fd65eb92628ed0ad7177ce53125c3a3d4c02574a38c983acd734fe3d5231e7a

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