Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2ba99fc400ab19…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 16:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 333eeda87ea1b49504caf33a69f42434 SHA-1: 8a9708dc739b91ab46afd3a53027b24edf4e18ae SHA-256: 9a2ba99fc400ab19f5fbac667bdcb8a978a9cef156732ab7c66cb7cbaff609f8
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, suggesting it's designed to redirect users to potentially malicious content or for SEO manipulation. The ML classifier strongly indicated maliciousness, and the structure points towards a link farm or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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=how+to+draw+a+mustang+car PDF link annotation
    • https://vipbeachhouse.com/uploads/editor/file/kirelaseboda.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4457a830731d93282beabb311475f017/61344724086.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rt7ul78hs2517ets3sbs3qldn2/61828471607.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mrk9qcv2u8rl1653tekc5tevg7/zipunive.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/daxejawutotawiwexoxere.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/vuwolonadupajabi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8535bc07a7---jerosi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fe417a69373---wizevazaxaxaguloli.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6361c98c5---77172109915.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ff08cfe1eb0921b76165e87ed1b39522/nivosojedulawupez.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd22a24b79b---tijeruzerunevogobid.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/65060335863.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/budekosono.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf600baa77---mavafotulexuwanabilov.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e9e4d20c64e17122f11ca0278e17abb7/pifumewase.pdfIn PDF document text
    • https://subded.org/userfiles/file/79635155491.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612114bccb25e---39532805486.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/vedatokujeve.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/nikiwidusupe.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/xadakuxinatuw.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/zerudan.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xebasaxurabeva.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/22165085031.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/59493459209.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ebc4b6ac---libibusalovewusu.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/61122317653.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_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 10620 bytes
SHA-256: 3bc2c14e0f5ea9e762f5ad811bf7e8c99f90e448db3dc95aecb07c1a55fbfb72
font_02_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 18544 bytes
SHA-256: 7dc7a6dbf1bd56d1401514aa5a27647695dc7ee910682924a7a0b0927b72e8f3

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