Malicious PDF — malware analysis report

Static analysis result for SHA-256 1031de9ee1cc052e…

MALICIOUS

PDF

103.2 KB Created: 2021-07-05 17:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cabde4c4b54b195af871c37490ca3c0 SHA-1: 269858ca87b8e35b98bbe2d24c6276b84bf22cd2 SHA-256: 1031de9ee1cc052e18470f8e80d126dd5ab50b9d3e7a1fe8deff5fe4c3381680
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and links to compromised CMS uploads suggests an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://smidgel.ru/uplcv?utm_term=pmp+processes+and+knowledge+areas PDF link annotation
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/47475e4ea3eee686cb1d71c0b6a4e97b/napufujofewulud.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/5htoblv0h1ntbg6243b2l57865/81908412981.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/72592194759.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/30a2cc94887aceba795289677c0ab522/72707664945.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5f24l6ms1qu3r4puuaqdeah1p9/gepajewaj.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea6bce55b---gajiburovimokoker.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c995736b---mewunubumagibabofuluf.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vs7o6n8of2j4eqn9o2ffbeb4e1/73804589792.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/59083219443.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3a3511d4---20977807520.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/23616216076.pdfIn PDF document text
    • http://axwelindia.com/uploads/95702303621.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a6ed78f---famodevunuzexuxijexid.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fb03e0bcb88a79005298e8f9f9f2a0d9/napev.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/kexunoguseka.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sbjlijk61bfk2nsmtamum1omke/91788980853.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/92422368852.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/31128335533.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d31434aa---95302411051.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f9cc35adab27d094f1aa3f3b5f258980/58461495362.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/12833064133.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 18296 bytes
SHA-256: bf7f312ac2d08477061f4617b25399fbfe3afde4d601721e409ab7fd4723530d
font_01_sfnt_off000148e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F9 10844 bytes
SHA-256: 674d84a4dff9e7d77d96bcedb70716447457aeda73ea4c5de190b7003dd2b566
font_03_sfnt_off000179cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CF 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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