Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddcf576de7dbc59…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 15:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f89a729561f282c45cb916aa0e8d002 SHA-1: 7bc33e1027250a23414bffbda56b01b5c9011d30 SHA-256: 4ddcf576de7dbc59c91a53db90423fae679f78c0b08ed10401bc4de032282022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malware or conduct phishing. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of malicious intent.

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://futimisdev.com/userfiles/file/76409448048.pdf In PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/bazojuzosemo.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vijivujamereberazalutadi.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/wadirifovesokovukima.pdfIn PDF document text
    • http://napiarsaigh.com/images/35251907841.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8da3637e---10217034475.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dced8092ae---varujenowizoge.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139891a8a6d8---wisujirutazaminexozukab.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/dufawuvenub.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/27050100147.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613438b9db64a---vuniboponanogufob.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/bodipanefaxuwime.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/vururolosifosukiguz.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/106106278be9966ece2c836160003b6e/98505066264.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/25873655140.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/aaa37436e0ff3a1a5c8f31d48f443277/gogosejaromovejos.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78d28be0b---51563911019.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef15e2b0fd---15570409556.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/13275139516.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pokezilagitipularusemane.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/nimigedevinifokezowabugew.pdfIn PDF document text
    • http://allasclub.com/campannas/file/nubokelud.pdfIn PDF document text
    • http://mopron.ru/upload/files/10929790797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=install+google+android+on+pcPDF 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_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 10640 bytes
SHA-256: 8e6e003445e806a6008a3f75aaf0f076f6078d46ad6f6120acc0655497cfd02a
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 16568 bytes
SHA-256: 2b3a457cc874ed1a5d42db69ddacb54cd89df2b7375d31aace6e397828e879e1

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