Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c3f41047318e1f…

MALICIOUS

PDF

95.0 KB Created: 2021-08-11 05:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cf223c1a42811ceba953afdc9a122fd SHA-1: bde928bb04ad3ebb14a4502beb3ca35c4afcaa87 SHA-256: 71c3f41047318e1fb11a0f79a3ad44a9d36451ade59938739f3030afd292324b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://huntic.ru/uplcv?utm_term=standard+bedroom+size PDF link annotation
    • http://ekolojikweb.net/upld/userfiles/file/30313422961.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/73253907130.pdfIn PDF document text
    • https://cooperspick.com/files/losikaxajinolu.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/2708329082.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/36774364478.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/36356963396.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d34e0020---56321691321.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a2cfda08f12f80193ebf1f246450ed36/77998928064.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/zunetezerop.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a78177af95ab515217f5ece37d7c989/18510433883.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97baa69e6---zowiluzar.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/ripuzigotewirogum.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/98198564430.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/zezapupusujuwuvuji.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gjs3lim064up5esq6590sbh29s/duzapijixe.pdfIn PDF document text
    • https://robertbah.si/files/file/9721846222.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/83324424308.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/nopetukowowufavofotuluvos.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/poxaxarudinigikafemeko.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/568d761f864b3121818c49e80d1b5cdf/78570539418.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609b753d818b9---49516111081.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4a3d54686be656e15fb50ff968b2c051/51171316819.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/kapizobufuzupemufosivo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/io1stfvhandev7o27d93jdlku1/33247484867.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_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 17136 bytes
SHA-256: bf1b041e80a48f320fef41d5caee35c6ef2f30297abc961e2d30360ed5a598d1
font_01_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15567 10636 bytes
SHA-256: 845d5a87fc972e4a888f9c972424f1c6f7033db30315a58dd4a2310e16f86b5e

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