Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb97715a69878696…

MALICIOUS

PDF

69.8 KB Created: 2021-09-01 10:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96c53ebd31fbcb2af5c70d8f35428f3d SHA-1: a054e9012f39dfd3a392340439e6aa8f4f03ba3a SHA-256: bb97715a69878696780e6625d15d878bff1159476d5446bd6189953f922a3350
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 other PDF files hosted on various domains. Heuristics indicate this is a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://transport-vehicules.fr/userfiles/file/26829418196.pdf In PDF document text
    • http://studioambienteterritorio.it/userfiles/files/jozopusalubezese.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/tanejenuvovilaguzi.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/karemekudawusafeka.pdfIn PDF document text
    • https://polandpools.com/contents//files/59639803591.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/76511270641.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611757bd285d7---xodisilaxagenedakomit.pdfIn PDF document text
    • https://papiratisk.cz/soubory/japokixarosulebibodix.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/37566528272.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/37848536727.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/13663167944.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd195146f---sinerefafe.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f531c117a5---zajefitemuxufedilitijo.pdfIn PDF document text
    • https://tomas-music.com/contents//files/tububosedulikanixipofevew.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2108e61f---dogutesikanodosidutedut.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f351d540---8883203923.pdfIn PDF document text
    • http://jump360.co/upload/files/20210801152126.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/bkjqc30tm75i6otgb8e6eqn4b8/nutaxuporanoludu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086274098229---93378741269.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xevubane.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/xapowibaper.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbaf8431b---63227449453.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb20b3aa1---nitarizefirefevowig.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4211f2df78---38251437913.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/11635665327.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/raxejemotivetedetivegira.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/44611254866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=d%26d+the+lost+mines+of+phandelverPDF 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_off0000bb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 14268 bytes
SHA-256: 5f2610d5417118b106d15f6844619689bf801b20561b1e4c3fc4731f54e23446
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8

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