Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b82b35d05ceeae…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 05:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f470e1ad824051c120dc15e7976daa0 SHA-1: 61a8c6475efef68aa15c259e12317a6e5138c940 SHA-256: 32b82b35d05ceeae4a9a5425de4d7a4881211a77dd01759d67779ae6020119e3
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lead users to potentially harmful content or phishing sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=cofferdam+types+pdf PDF link annotation
    • https://creativitagh.com/pevron/www/img/file/gafijojijiwakibo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/g0lnmd9c7mm1b3coub3h8do6l0/deweg.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8fdfbdc28c780af6a27380d7c3b90b0c/sarimozazimug.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/kelat.pdfIn PDF document text
    • http://normel.org/files/upload/file/lofojotimiwep.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/kikikokojolan.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/82h6ea4iqs8hg7ofq1d3f2h523/66587508778.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/wolipajexibaxisibobu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f55972da4ae---66390584879.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/72782748079.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/83959295258.pdfIn PDF document text
    • https://panama4d.com/contents//files/41496020904.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/jkvteh2jrkllsuk0ucc73lg17n/98234821714.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/53216036208.pdfIn PDF document text
    • http://recrute.fr/files/files/43490917994.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/tevabotofevemopanez.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobugewiwetawogewo.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/57113895807.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20218212310331673.pdfIn PDF document text
    • http://klenderbio.com/upload/files/kipumik.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/garukenetepuzejib.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210605004233.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16108de9a6ece3---96209720389.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3c4b613a1cb477f722a69803f9962f5b/8690770698.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/sopazezinudu.pdfIn PDF document text
    • 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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 17072 bytes
SHA-256: 523d51e61d456917ad2b54fce7ffbb6fd2c6a07fdd397b7f48141bb59a978398
font_02_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 10564 bytes
SHA-256: 2ce5d3be877d6c19d320b6f0f43a3095cd892c1acb08850f0105dd47dca2a674