Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5237b3e6dee431…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 13:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a52e2ead4858166f463abc6c9d169bb SHA-1: 3beb715d21e9649e8c884ea995fd5410c29f9d65 SHA-256: cb5237b3e6dee431356872baca750453d9db3d9746bc356d8a52ac4833989342
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to other sites. Several URLs point to WordPress uploads on compromised domains, and the ML classifier strongly flagged this PDF as malicious. ClamAV also detected it as Pdf.Phishing.Trojan. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161369c77562d9---mujavijidexo.pdf In PDF document text
    • http://itaxabc.com/userfiles/file/20210907052607_133802191.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xupujazitila.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/vegozuju.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/vovibufumud.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/mufogimuva.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vifasesu.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/junubalajenimeruruvi.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/fewurozomega.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/55268275715.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/laxugan.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6a839toavrqfmcgkac5n3k1m14/kemekugoweganonegawe.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/kanosapugokow.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/18420140537.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/nomadomiw.pdfIn PDF document text
    • http://keyday.ru/files/files/tozisafezulinoluta.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109022027454134.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/vevuxugasogufajowup.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9ca7c4549b45042994fa314b02555f20/dafilevege.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/41936e9a09e21e700bf896325c05ff50/ninerarawukezixiji.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/92204678950.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/34327636711.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/71288738478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=i+want+temple+run+2+gamePDF 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 10472 bytes
SHA-256: a729d75cc09c0ffe2a7a0838aaf08c8dccc775c794dfe102e7a72b3e9a2c2cfb
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 17920 bytes
SHA-256: f6f9188ce74de352e2505957954b111388afd18cc12f07704b804da8fe19cbdc
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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