Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b4b02998a26629…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 01:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8059e82d3fe7c6d3850006b5fe93a1e1 SHA-1: 219a90867446a2e53b45dc6c1ebe5a1719f6bc43 SHA-256: 95b4b02998a266290d5bcd25d34f41980715d55bf663ca3fa67531ab9d84913a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The primary goal appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=kreupasanam+udambadi+prayer+in+malayalam+pdf+download PDF link annotation
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/24995785029.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6560a287c2---fowubitefupeto.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/90188086805.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/64503259859.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/73332924574.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/90966578848.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/d7ql32oq0cbjsin5agjd4bnk74/zeguwezetoneripe.pdfIn PDF document text
    • http://sdes.in/uploads/20366950239.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085044c27ace---24568438764.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/24146740692.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/25299v6dee5fm9ik6tluh2cg57/27147416288.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/jadazosigarenanubeji.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/34908493994.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a458b0dd7339d16f7b50447672258935/venifufusimametakaseni.pdfIn PDF document text
    • http://iphysiology.ru/upload/lamapu.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6d6cf2071ec7736336dbda6e25925793/122898164.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mm31jfpe2g968dbqjq4vfk1n9n/31804139880.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/523cef0767ab06650b923c18d9355ad2/gufulezixubozajiref.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/17299825247.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/272a4fee47a573409dacb4b3376390ff/87247054625.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/zonuwototadiwize.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/84052868216.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/rekslm0ipv4avc28q52brmfv80/vudoganakironufibabena.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_off0000c870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC870 22180 bytes
SHA-256: 81b2a312a02b8c81e09dadb9e006cba66e89742f53b8cf6ab409e7b43a1bd35e
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 10992 bytes
SHA-256: 9ec3c7d19398ea21ea72b12402d1674cbbd7178ca8e3f18cba698ff4c699fff3
font_02_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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