Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46674890647b8d9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 16:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfd1aea3cfb1b1b691126dfa59b77dc4 SHA-1: ffc058dd70a5f8dc4f89681f2322adb59dfa4087 SHA-256: d46674890647b8d9ba74b3edd69b26f1e0473f1241197d1cd7e263b4c1bb1c02
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=gramatica+en+ingles+basico+pdf PDF link annotation
    • http://www.hausman.eu/images/wyswig_images/file/62361172218.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160770fcf36e1a---pafimeb.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/mefopasojavudofid.pdfIn PDF document text
    • http://philboyd.com/lisubasezenejinodigurizi.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/nanelemisip.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758b70c7f24---rabogefixidutokaginaxe.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ba95d66a---tasovisowizapusomegob.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/67677874868.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/fegaribudujiwu.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/87076369437.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/96805c5787873abd3914ca922271666f/wojowonefifamok.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/25470799290.pdfIn PDF document text
    • https://basisnomor.com/contents/files/jujekemesoxexagi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4d3c5ecf---40406809362.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/87291016420.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a897a218433---dufavageriwifixetukapo.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/rujonokemanemozamajipob.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480ae17776---99038427536.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/97776967716.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbef3f9e9---vonefibavojeni.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/wowamofufanis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d495b36f0b2---mufobananovitixapibazase.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/17285b71824b2ac5f729121acc399c87/68519920105.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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 11140 bytes
SHA-256: f5e8c66a2d0af47fda7270f7cd7f7e873f38575acd60ff4060c8f3c612e1019b
font_01_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 21180 bytes
SHA-256: 4f1230b216712b47a8d4b178de04cecc7c40dba1e26c5620b5cfc90115e898d3

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