Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0ce04f7d0dc2d2…

MALICIOUS

PDF

85.0 KB Created: 2021-06-25 17:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e4d0b2f7175784112f2c7abaa210012 SHA-1: 9579b55eadb7a369dee2479cf94e69feeb99b605 SHA-256: bf0ce04f7d0dc2d2d0a29ecbbc8344343b2d66ddd6383c376f95e45962417d61
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb5b56bc8---fudinuzexolukoxelupezetig.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/nkcnnlj35tgq22rt4oodmivq9c/razetojapuvazuzamaxo.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/8016502977.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ipi5f0j4rnintnqle4ul8baeod/82304389510.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d219cdeeadcb031c9589fac6aeaa40ee/vigijisegeb.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f6501b747b2d0b01b3f9f34a955a422e/51349557162.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160743e67005a1---fakamus.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ct92n4h9rdtuonhhvkturnqdk/nazowake.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/03700780422aa3cc9555cc294def6824/86721872797.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/tugiledatinivogik.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608255bb37e9f---muguvubi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qc25ebvhito7sab206ie62ak6h/20183163019.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sonosujuwudelezujivopi.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/7131499325.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/11253167761.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82208bd37---95146451706.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bec4b76e3ca---85206883171.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/soladafepisopikevemigakim.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fb5c843c00a3497bb25aefda2390fed7/rifole.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59590a149---disakirijutetufizoramose.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608613d0d11f2---boluwalopidafe.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/061d1f08a3684739baa4c419661283eb/81618808319.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/miloxalogaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=athena+and+telemachusPDF 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_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 18116 bytes
SHA-256: 3451c0d8efeb7321f3161409152b02b8fae516b461975b0f9eafb394fedd2eff
font_01_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 10404 bytes
SHA-256: 888f20146fd0ab2001153d62878731042bd4f5edb05b4c90d0b5eebadfc3ea56
font_02_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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