Malicious PDF — malware analysis report

Static analysis result for SHA-256 50447b9ac9c807cd…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 11:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2bd309eb444e914611c30764977488a SHA-1: 952adec03aebe530c0b18a806f72d443e9924078 SHA-256: 50447b9ac9c807cd8975ef3495f78a28169a95d00f712f53d067a8d4f5404353
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. The file's structure and embedded links suggest it's part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e4d40560a87f350d6abb144a01c0d5ae/79913324699.pdf In PDF document text
    • http://paulgraphics.paulsfashion.in/files/72431628301.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/mifigoxujiliwofatovimapo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613012b25c04b---2454069420.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/54122688060.pdfIn PDF document text
    • http://apicn.net/upload/files/81492466103.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/93f5bff6ea43835c957d47c8e8bf76c4/zawix.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vowojodejilalazorunebeko.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/firupokinojalatimelanuj.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/42411029834.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/gugunetubixazunepewagenub.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d812d7672cb3f6292314f5e57f81ba12/nuguraverisidaf.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/38104021559.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/69469721773.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/peguxokipijujegaditijoga.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210908035409.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/pugajabuno.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/beboruzaxukedeg.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/26934511464.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/255f096c9e3e555b8866425d0bd85bb5/36292823882.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/37897635339.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/hleaqtpu7msqglr85gkb1o1n50/wowenisubomamabuwukuga.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/fuvubatadejabedux.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/mebaganutelopa.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/xitebajadapazoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=leyes+de+exponentes+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_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 10264 bytes
SHA-256: c808a25685de39fc6a586573304e50d819ce313780daec7fe29581a0d32f84eb
font_01_sfnt_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 18260 bytes
SHA-256: 2d09176adff96c773e80f796f38b1433b07f087a394cca7db3f865b1b1a863d4
font_02_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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