Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6f9898644bfd08…

MALICIOUS

PDF

78.7 KB Created: 2021-10-07 01:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e9f814506eb766ad82dcd05fc2d804bb SHA-1: d29a2216ef1ca81d1f8684d2b6807158c4473dc0 SHA-256: 9d6f9898644bfd089b525b5c4fea8b204a100edbcd293c411230327620ba37fd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially harmful, web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://studioindelicato.com/userfiles/files/7160102266.pdf In PDF document text
    • https://interstudy.net/userfiles/file/49056421568.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/ripoxipixujigag.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/161daaf075b395a5cf6eb0d4b052b50c/78550605796.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/96987058397.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/28614686303.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/lejotixafarumonosonog.pdfIn PDF document text
    • http://terrietanaka.com/library/files/73152804084.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/16203723800.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/degirat.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/noninusisukinufusavojike.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/filuwulokedi.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/73647331453.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/trmmtf0m7fk0nl52kon4t984j1/kijagetavilamadab.pdfIn PDF document text
    • http://le383.com/uploads/files/baginasezugafa.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/rajazo.pdfIn PDF document text
    • https://cape-electronics.com/media/file/9158711259.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614301bf9db34---wularidevawumapojogi.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/fusifevobifijuxinego.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/jireborinigiziliwesukamog.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615b1e1ace2b5---vowox.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161580ba762900---84067306584.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/22306153173.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/lovoxafasegifabilubajala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=resistance+welding+is+aPDF 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_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 18132 bytes
SHA-256: f183e0f17c66b1e49c8ca5431b22ca9d4cfa787b3faa1e54c3d080c18a2bb036
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 10456 bytes
SHA-256: 1dd8497545249944175a2645542928639ac80aeee333120119873532378334be

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