Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c2adce5a21607c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 13:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7589b49ba9cb83c2e41575340ce78fe8 SHA-1: 3997942225462fa0ebe511eb03d3c00c6be6bd9f SHA-256: b9c2adce5a21607cab346a7cc63201bd3202f1bcf9f90843693ffb8242eb0e53
96 Risk Score

Malware Insights

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

This PDF document is classified as malicious by an ML model and exhibits characteristics of a link farm. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the ML classification strongly indicate a malicious intent to lure users through deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=earn+to+die+2+game+online+play+free PDF link annotation
    • http://architettogherardi.eu/userfiles/files/4256537615.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/18704559819.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/595b917b0bf0b420d53e22c7923e9e88/tikalenibakokunida.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/93053530068.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/mesagobaligenolez.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/49991661401.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e271d2de9b1c29dc9c5351ef74b5b324/farabowevopekukisero.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/24574818609.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/juwipanegewuwujeponamu.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/63203228429.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zuxidukewunexagotogibef.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/93896916145.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/bizoribabiwiwotebut.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/86173164824.pdfIn PDF document text
    • http://analhospital.net/file/files/80147376883.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ebb50696d2eb8cb17ffff4c0163f097d/90339048138.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/14621934188.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/pajexolutotemafe.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/76247230733.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/pogixurunapefopuzalelo.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/jumodobuz.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161300010b02a8---tosemugosazivuxagumuf.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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 18300 bytes
SHA-256: 6adc01db2cc27d7173f61860c0fffef1f1bfe3596a47a9b0f09599a20135a619
font_01_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 10892 bytes
SHA-256: f8a37e52ab1c81b42d4c7329d886ab9d8472e2ba9c5aa7875a71f2e60be3cec2
font_02_sfnt_off00012621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1