Malicious PDF — malware analysis report

Static analysis result for SHA-256 5021c46df8a8faa1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 18:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ec356cb818350107be17b262c1e500b SHA-1: f921c47aa8b5ca23c1e78a14749db40dd3f4cb5f SHA-256: 5021c46df8a8faa1d50726a150df7c0d7ba8dedbfe8ea3cef387201fff5d467e
96 Risk Score

Malware Insights

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

The PDF 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, supporting the assessment that it is intended to lead users to harmful destinations. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=lenovo+thinkpad+x220+docking+station+manual PDF link annotation
    • http://bukharageorgia.com/sites/default/files/file/sudigomositaduk.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/9572498480.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210714043426_sgutc9.pdfIn PDF document text
    • https://actorconseil.com/files/file/83635564979.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/wakovojixurojet.pdfIn PDF document text
    • http://adveotec.com/img/file/31891580253.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b00f34c4fb6---fenemawaguvukamekijip.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/tapivevulo.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/libonideselesilulajovoxi.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/37298945621.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/73qv5q4e5bqkv78a81hrkckdu1/92780586318.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/686dc5ee748cf04f58f96b7d34250180/66224979957.pdfIn PDF document text
    • http://veitali.com/upload/files/meguda.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73dad09c9d---bevuzeveduz.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094400c5f96f---98320226830.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f610fdc33720ae4afdfcf50db9cf9fdc/kirud.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9ab757d37ad4d05bbe9e6487995b11bc/54889659987.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/31009454258.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/3699599223.pdfIn PDF document text
    • http://farashimirooz.com/files/10695750128.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/39798723180.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/kazope.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611af3a547fb0---22457324501.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f868acb9---18030485634.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_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 11420 bytes
SHA-256: d13c7080dad6f370c0c6398cbf3945c128aa1083b8043e228b5640aefc44efee
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 18344 bytes
SHA-256: aa79f21168ea03699de9cbbfbc9182e74d96a48d0a9defa16d3cf1bfa5f22384
font_02_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1