Malicious PDF — malware analysis report

Static analysis result for SHA-256 6daa5b2b020b44d9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 20:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c593e19692dd38c1da65705e655aa9de SHA-1: 4ba70baed320df6c35c5dcd614401a02eb81d47c SHA-256: 6daa5b2b020b44d977defaea5b931a6e9e2cf6e9416ac17c6d50b123eedb33c7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=2+line+whatsapp+app+download PDF link annotation
    • http://www.trisad.kz/ckfinder/userfiles/files/nivikesubajirinibanebo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f3b1d5464b346e98b92d8bb928ad7925/67139582215.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75907107f---25916304593.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/63907599122.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/21886718686.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/lafural.pdfIn PDF document text
    • https://matricula.arendic.cl/files/87969852156.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/7322596863.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/6655560112.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/87126734862.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613120f18927d---20810961769.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/vaxem.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/bulixafi.pdfIn PDF document text
    • https://izr.fr/files/nubazijow.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b52acdca---fovorizuturadi.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/40473840408.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161398d8d65c6a---sulivijuposarafi.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/32127403362.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/690abc9df2528e03f220996c17f2b064/mevuxamiratunopufujeva.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e480a2dbc---butapuvupeguxedajediwezip.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/94490304372.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/10957200273.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/tofijebebuxatudowez.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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 10496 bytes
SHA-256: 9e4a7c214a4d75f8c85f90e14dd4eb22b41a2a3621cecbdaea95518f0ab520e4
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 18380 bytes
SHA-256: 6dc996026ffc438eede30dc29a8242bb11aadf616bc96a8d8fa5e3fa32647683
font_02_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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