Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbc29ce73d2eb4e…

MALICIOUS

PDF

88.7 KB Created: 2021-07-22 21:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bb9dd40846f4c8600f50f59e704aee6 SHA-1: e3d2a8bd324940eb10c935024464f9bd227426b4 SHA-256: 4dbc29ce73d2eb4ee9dd4bba21298399e6a1314531759e46bd0f77af208763b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to host and distribute further malicious content. The primary attack pattern involves directing users to these external URLs, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087e488ded62---42273575507.pdf In PDF document text
    • https://augsburger-dartliga.de/uploads/file/54384521489.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210630182204670173pmg6p.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s7ehasrs3n7k3j1a5bba6cv2p8/83698414886.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/cb4e254a447f8eeeaa5435c0fea0ce5a/18435881951.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afef2402708---84573412119.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/74509343912.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/gadulorawisiwozumeduredi.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/83398772881.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ovaqka9p2ti9jveaimqni1a1v4/defadesanafipet.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/85221088e55d305a1ea66f493269e88c/5469131911.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81f274b95---13792612730.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae1ff1b4f---99213329854.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/wupukexevepuzifumara.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/53478747942.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/najadakuxipaji.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e878871869e---27963892291.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/susupekewofofukosuto.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fab2b2589---luxikogikopoxedebe.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/jadojazizejomonedibezuji.pdfIn PDF document text
    • http://ibb-online.ru/f/file/pusel.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/a3f56c5f89691bfd1cdc28df8449b1c2/64055465285.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/u7ga5r7o93lkdoeke71ipu3hdi/nepagaxosadutanevazu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/61099ae0fd354179e81898559d4e5a9b/71556129823.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/99251943956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=actions+speak+louder+than+words+examplesPDF 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_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 17156 bytes
SHA-256: f3f7e5b79638c80d9091dc4f76299eda7381b673ed9b99568ea56dc3bf933541
font_01_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 11140 bytes
SHA-256: 674c33f6367233d14f7b9765bfa265a9cb9626ba09cd7fb3d4d1a70ce5f01c9d
font_02_sfnt_off00013c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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