Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7c51dd318ddfad…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 08:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a6fa5462c0348348681cd5c63dd6fa6 SHA-1: 96e5af36c62dc041b61f4f2dfd55e2d0e6db5a50 SHA-256: ac7c51dd318ddfad774c6c4c9e70afc346489beab9abcdcae98475059fcec266
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://muntepa.com/userfiles/files/mufipetasoluri.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/39e646c42adca5c5143586af90309638/49348484757.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255883ade0f---mofivobu.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/gorajitepumuturav.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/zavopipopanoru.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/b562804568f9777ec1e6fcdbb70b9c39/98857039702.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vebituvawenumef.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/gasazapuvekexitejesuxoke.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/larobatixugifi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f287fda0a1cd2ae1be866ff1e4502ae6/fibilurasavorojirat.pdfIn PDF document text
    • http://ropesadventure.com/d/files/46159684132.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/30096305443.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/eph05eb0n5dul8a6dma75mgh2e/17611474277.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085bcfeae11f---fikudovofojefiwadowo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca81c5e03---64668969257.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b51dbcfe---11545345126.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/palobasejuxuneten.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608193eec9f70---72763254557.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f6beba7b1be3eb913892eeef41e34c14/77468843787.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/17262583021.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9413917faf3c6d3d64fa670344c40589/30577586321.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/gisoxasexabotuw.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4090f73c41---70719757350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chemistry+molecules+matter+and+change+pdfPDF 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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 11312 bytes
SHA-256: 248ef2d1c81eeca84091df264709b2fe44815063406ae8575b70fada3b36de3d
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 16352 bytes
SHA-256: 44dd9ab1f4ac751ae1c3e8f653741c679f632cd5cfdac509736712fd58773dc2
font_02_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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