Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c2f61723f786f7…

MALICIOUS

PDF

79.8 KB Created: 2021-08-21 11:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6b77a912b5a7f571d7e4c73363d6ee0 SHA-1: bae4d3f147e5d846ec392db42317528ebad565cb SHA-256: 35c2f61723f786f7f74d59d8734c4c5542a6749272ba1b3acf480f4c394098ca
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates this PDF is malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains. These links likely serve to redirect users to malicious content or facilitate SEO spam. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nscs.org/wp-content/plugins/super-forms/uploads/php/files/cce5be0625034185664711b6c24a6fe7/jakevoz.pdf In PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/75777255490.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/rilotu.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/lanapomirukikunokidem.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b9ba21c5---20881747732.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cc97d60827c---28205566071.pdfIn PDF document text
    • https://unitjaya.com/contents//files/luritovewapo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9efc0231dc9d9bef049c6ff5b661bc22/93093902794.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dc7d652c---zulinifopub.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/62097160675.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a66c7f97---nagekunenejabeforajewud.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/tomojim.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/rozujejojoxekubelodeziraf.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c466047e48ad67b5fb5a31059d28fdfe/pasonobexagifipowiwegim.pdfIn PDF document text
    • http://skncn.com/u/files/kulodexojuvofimoga.pdfIn PDF document text
    • http://immopolignano.lu/images/wekonore.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/8234577787.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/goler.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/i6vl0noc559k0k4bsaate3ppk1/28642759463.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/69584169218.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/20097822433.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ec7eb25cf80ef272da72d3d76f73aec2/xukukuxufutula.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/pakedoxukim.pdfIn PDF document text
    • http://chieucoingason.vn/files/24305659191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=wayfinders+guide+to+eberron+pdf+trovePDF 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_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 16676 bytes
SHA-256: 9c90031f3ccd3ee0f8c359915b3b2137dfd18452de2ea2a0b8ab5bb542d56cfe
font_01_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 11040 bytes
SHA-256: 3a490f2958d4fe655dab0d6f69aa12dc9afa977b3e912fd36130856a0493b418