Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f45fef037487ad…

MALICIOUS

PDF

70.8 KB Created: 2021-09-16 11:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8410391296f4875e4eb28226a3ab20d8 SHA-1: bcc878a7b88f1486582b882028cea25931bc26ec SHA-256: 13f45fef037487ad7a1dc44b67853f2e61f29c9d965cd822fbfd49cf336e5a86
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting files. One URL, 'https://ketchas.ru/uplcv?utm_term=download+tarzan+ps1', suggests a potential download of a PowerShell script, indicating a likely multi-stage attack. The document's structure and the nature of the links strongly suggest it's designed to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=download+tarzan+ps1 PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381f8c59681---90703167278.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/43242757916.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/28997639153.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/lofemufujikejusisegana.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/wekusavolexabu.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/rowinelegidilumed.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/fotalefusozepewexulizexeb.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/43977215583.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/40775830753.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/nalifomujojos.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/xebagozipabijorejipi.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/jemovetamuwasupox.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/sevarolufezova.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140712e11e58---65356248625.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/30004209374.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/korujajewesibunidasora.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/komelexogonoxivopim.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ab383025---dabidi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3ac428fb---74193533688.pdfPDF link annotation
    • https://claudiodituri.it/uploads/sijemadowinigaw.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/45482728493.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/xumidusidunugapolufopodag.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/sefuzumodaxokobodos.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/bodorufinavegam.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jekubofulakaviro.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vowojodejilalazorunebeko.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_off0000b6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E8 10360 bytes
SHA-256: 2ee805255b042902b3e07a79c6342b0fb021a649f68ee50caec44c341e53dd11
font_01_sfnt_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 15120 bytes
SHA-256: ae8be4f95fdec15a541f7cc2b43424007a147f277bb58e589aecf43ebbbdd52c
font_02_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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