Malicious PDF — malware analysis report

Static analysis result for SHA-256 e674abfeb34f3f32…

MALICIOUS

PDF

86.0 KB Created: 2021-08-21 06:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b57b2678f3a6a89137eca81b539831f9 SHA-1: 485ea51d5f8a186e1214a63ca61d79fba24f0d78 SHA-256: e674abfeb34f3f320add18562e2b08a1c15e4ad66efd633de052cdf60fe955b8
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute further payloads or conduct phishing. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://alt-1c.ru/userfiles/file/suvemujebaxuxivefaz.pdf In PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/16823401050.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/58523346777.pdfIn PDF document text
    • https://amblamy.ee/upload/file/43151390543.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084767e53d3d---dovovejowip.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/65886409200.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161058cb3834ec---96137059733.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/49827521156.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2462ff39---8051459592.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16073090265020---25637463054.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ba465ebae73cd47953684a33b1d4db90/71982772390.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae4dafb77---17766205610.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210803_223713.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/bojigud.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/zuwubobesotonit.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae535d1ac58---legedilowixazasi.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/69991130211.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-8/20210508163004537641.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zebujapitenupikogolutonet.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608417aa01e2b---fotazowenifafidomawunav.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160838875021f1---mebokopabevawasakunaz.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/rurokug.pdfIn PDF document text
    • http://pronobile.de/catalog/file/mixelusogawimokinunipib.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/35803271764.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/lapipetuxaxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=are+breed+restrictions+in+apartments+legalPDF 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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 10980 bytes
SHA-256: 6e7ecafd31f137a6538c677960289b6d24e47cf5405c2a983ba3da31da3f2f0f
font_02_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 18360 bytes
SHA-256: 8200b32440e58954312791f3246a2ac22cda1e45b65ff99b15cc6c2a6057bb39

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