Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ba1eee25408a25…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 22:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3eb774eb78135ad15a9e482e517a13b1 SHA-1: 630d15bb3b5d2e686ae547d743224d0b399c689f SHA-256: 97ba1eee25408a258f107bec4bb4e927b31e05ac220de0c6d978b947eaf88acc
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristics suggest it's part of a scheme to distribute content or traffic through potentially untrustworthy sources. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=edit+format+pdf+ke+word PDF link annotation
    • http://nuitsdartistes.eu/images/file/72914757300.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/85543355353.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/34008722783.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112f4a7903c2.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37701490164.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/00fbb5d8430a39914fa8998d6cede755/sativulanagukew.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f7e9e1ecfdac36f3c872bb0b01251797/90666669370.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/bigokibudinexosopisisefe.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/99741549630.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4418e05ac407ebd7e37036de9f76c41f/71091148856.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089af96518c5---76704676048.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/38169978810.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c4f39a89e---99988883797.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd95750d31---laxenuxedokiludef.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/dibujaroxikefexuje.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/20493270552.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a4e4822d0---jupoguxajiwoxomi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/dj3pdd5olb3r6l8i0n2ua1qo73/30965059962.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/70413578248.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/095876ed148204dfac39bbb1bd0de7e9/lapadegazatixi.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/0ddcaacfadb656e1f57e45928f4eaca7/jododedejirofukaxenori.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/wagivuda.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/wigebajevasu.pdfIn PDF document text
    • https://ms01bet.com/contents//files/kobuvatajemujow.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/22126352014.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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 16752 bytes
SHA-256: 55d398c3ec1e48eeb6e24a9b55fcb65a16549d958f7695805dea768d990a43dc
font_01_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 10500 bytes
SHA-256: 6554bb60925e05ac796fd4214a1952882a17836f6739e024743e1b3de4653b70
font_02_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1