Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c60618854e426e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 19:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ceb7a7925f3d93a7969e67c20e750f47 SHA-1: 3d7a1a00591d78d50e5688d91d80ad384aba14f8 SHA-256: f0c60618854e426ee9ae8a20182da5bf45c917525f7399bd38f0399b35d0650c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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://ortopediaszombathely.hu/editor_up/jowusudi.pdf In PDF document text
    • https://ms1oke.com/contents/files/miviwopeta.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/14123390756.pdfIn PDF document text
    • https://anjingliar.com/contents/files/tifalanedafavogomubijipod.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/xiwasisosunitezejuz.pdfIn PDF document text
    • http://eternoohydro.com/d/files/85142397661.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kojanumipesudivunogelodud.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/78551668830.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/34287478929.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/80277433490.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/togel.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fa794093c09f73f30159a0d30b274874/27397634862.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/walovubiturakifoxe.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/784882d4d23d7ca1c0856e5dd02f0a77/77969284672.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/25484035888.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/39528657735.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210910_DC4FEEC0B02CBE61.pdfIn PDF document text
    • http://xhzhengli.com/upload/36382151183.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3c6a6f7c61af7477aaa5e2136991ab97/zikijewelafugunajusa.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/19388426265.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090519043610981.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/karisitomukakobukuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gupt+movie+onlinePDF 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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 10188 bytes
SHA-256: 50f2d4089820df2acfd29a192fba659f7a65be032e0f23ee9aaaf3f22d336a13
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 17188 bytes
SHA-256: 3e470f722d529ac8aebbc4c325d097e4909781d14261483db38b68e434133c14
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1