Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f699b2019f5b33c…

MALICIOUS

PDF

119.3 KB Created: 2021-06-26 16:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2e8c3bbd86178e04858e73d6370675a7 SHA-1: e5a1ddf475d41da8050c9ce37cc75ce3face99c1 SHA-256: 0f699b2019f5b33c3ce6a546d50fe1f76a3efe3dee7ccd8d254fedee4d011a73
96 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious sites for phishing or further exploitation. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/00616d9efa5c9a2975e7a9885dc80eeb/lanedemafadozamegaretobij.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/4gpuil3iji67b61pn16j4c93i5/pijobidonogubisufilu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3ccdca626ca6a02795fbb35b8902d732/mikid.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/11fcffb915b2cf978c8e5e805101b2ee/92531579653.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2a85f25ecafec26ff7b53e8bc7d0ee1c/tifitoloduzom.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607395a1b9a2c---55337143146.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebab70415a---99136011003.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/jodev.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4lt5if18uq85ssplk4u8u1meef/11655102790.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/tuwibusidinilovukoto.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/11080471131.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/57263044086.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/76689737133.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/9905031341.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2mmlf51515n872sihad6t4m4ah/16275796265.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a9e31103d---19145497400.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/sefadetumixazur.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5f05913f78afdd474500adfd50d86c5e/wegafotobobozuxomomim.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/poduxagodalawugidizowovo.pdfIn PDF document text
    • https://bselink.com/userfiles/file/47136621776.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/kadewugunuxote.pdfIn PDF document text
    • https://menu2uplus.com/images/file/punavuzukofukisot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tommy+roe+songs+listPDF 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_off00017436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4D 10368 bytes
SHA-256: 94d2a69424ae7fac195d4ac3c5ff3a1cc67604fe26d8f43c980ab54e26aedc90
font_02_sfnt_off0001a3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3BB 17324 bytes
SHA-256: f9e933c0219025af2cd88e16acee8d3796f3a1cb2a10f82bd7310d54a6c46f3e