Malicious PDF — malware analysis report

Static analysis result for SHA-256 097000fc7f6e631f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 06:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 376a58aad7402da78cdfd4cc9002b408 SHA-1: 2c9481a9633da7c42748b635db18501934c20f9c SHA-256: 097000fc7f6e631febd9df6e68aca94624a49f8c3e2013ccb91bb99738d04951
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/sapibamu.pdf In PDF document text
    • http://managhantasala.net/mailuserfiles/file/bonufadixagavoletigese.pdfIn PDF document text
    • http://firegallery.ru/img/upload/jopiwojetojununapag.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/24135638993.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630730766.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/wapeximifuxulisijasoj.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/6791994041.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6b7ec39---berif.pdfIn PDF document text
    • http://bienbao.net/uploads/files/32627375321.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/dikodo.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/55012028789.pdfIn PDF document text
    • http://teraval.cz/res/file/20474730532.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41c040b92---wulezofixoxuzifo.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/68932307607.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/5705778959.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6b3cbfc394bbceb76edec03c159ab592/74140223462.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f10b2ccccf7290182f5469986710b56f/jukirar.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/54910870647.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/dolufalunami.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109080032381650.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/13157287201.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/b02i04nhtpv92snqshrcaapon8/23148267111.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/vanitezewidalulogofe.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/2853138962.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f3388cef255554d7040192259384a38b/gugopotokelojobuxutatix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=john+dewey+and+william+jamesPDF 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_off0000d48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48B 16480 bytes
SHA-256: 64a39e48aa4606e859a832fb83844606f8f11d46cdb322f1b171c99615860d2a
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 10636 bytes
SHA-256: e0cb724fef7f160551cf4191ea6582ff33f7d319dfe0d139680611a02c0df854