Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f620157b7a1f64…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 07:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcb72968675deb51b651e54b468e0548 SHA-1: 3bf3349ef74d85ddecd8edb61f84f49a3f8eb74b SHA-256: 73f620157b7a1f648aa8a8060b1e3a7e9c25fff17a3dd66a0106775ec40e88d2
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. Heuristics indicate this is a link farm, likely intended to manipulate search engine rankings or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/21ed0873e54031d0321538450ef893cb/totolamisubizozadara.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a2d2c0a5a---fenugedumimekotalasavum.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/86544377362.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gaxopejepemipifowo.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/nivifulanefix.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d40fb631411b37c2af3f97a7da7e05b4/lumiv.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8bf0a4964---70941925958.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/robuxarikakuvogi.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/xepirevasabokoziradebozab.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2fvmc6k1ceg58tk97j75kg31ke/mediribiset.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/83dcd8f2a7b462d7942bd97e4e5892af/sigevifizuxo.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/pesuxiwozofusuvimop.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4424cccd6181f31ab0421d640461da17/xumusuge.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210706_2C57F90AFB6A2004.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8f6c83a1---wofiwib.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/85728263651.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/jefezasetaralewe.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/02fd4d9cd1829df2140981c750c56a57/rezexupatidiwef.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/73482256684.pdfIn PDF document text
    • http://servmed.net/userfiles/file/84717107335.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uedrcoog4ue18e2sl24tvvjfn0/83765684284.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/nubezewoli.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/raxazibepakatebabaze.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/22060958398.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60aaf1c74---bisunixu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4be96ef3---47743354224.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/98502579014.pdfIn PDF document text
    • https://labelmarket.eu/data/file/58288948123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=uel+logo+pdfPDF 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_off0000c8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 9956 bytes
SHA-256: ad4b24e16623909bbfb6f8323b2af99f8b08f6f78b5960b008ec565234fb4243
font_02_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 15932 bytes
SHA-256: d5b1e3f8ac492869d1ec56dc0431b3c963269c17f301bea8bd2ad9bf00cb406d