Malicious PDF — malware analysis report

Static analysis result for SHA-256 3814cc838d4175a7…

MALICIOUS

PDF

83.3 KB Created: 2021-07-07 00:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de5852224f126d2760ff46d41e44c1c4 SHA-1: 870012f5c533e27918e8981dd356497e800ce624 SHA-256: 3814cc838d4175a7d1241ca927379f9c42a9110f62d67472fc6f626e6215fa24
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://west-holding.com/userfiles/file/kakufunilupedolegaxeviwev.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/3orsm25bor1v5gjnu8k1073epa/jifojokegazexumop.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/08408027c9a570b363fe0d39d7ce2ebc/vogenulubugabazafoza.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb2737da1---mojene.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094522625933---puxudowerimixa.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5a208b92---8876832939.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///zuxenemufew.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/79203281151.pdfIn PDF document text
    • http://ekotronic.eu/files/file/nagefamej.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/77462738766.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a322f826a0---47249093701.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d8g5uf2ujdhq6mbogug6t3iof3/baratejanevatexovezox.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/nixudilivinikaxid.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/550d6b9bec1783005e7f6757b0a0af69/96845864687.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8glp5iobnu4t0874kdia5i8g88/felotanujevutewubewonufo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/botld73p57mijlqgtmt47qpaan/65231644540.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ghaes54ts1v6odp9gm53l4p5jm/ranuwowanego.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/jesexalusofosav.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/228e47864c08a3188d8c195a24231e58/balesowotarizazobije.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/080b5e640001d73c04d96c80ada423fd/70824125646.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb22188ac4---9646798183.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/tufudorajutosotiva.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/vemefajibijosikawifolo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf9aaa5c81---dojekuzerifuwibob.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c930566fe0c---jinowilufugoxawogofo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796e5ae9719---nogizoxovixisili.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160809c7e97575---malazapedokijasisuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=international+space+station+viewingPDF 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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 10652 bytes
SHA-256: 7d6715ae0101324d434446ec75308a2bd6062923eb92b806a375333fc07c0e2d
font_01_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 17128 bytes
SHA-256: d6438fced3fd663405c84ade92729784c4fc5820c4a031aa6432e471537ecc9f
font_02_sfnt_off00012782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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