Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cd7eb1f96804e8…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 05:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af65fe1040a484b05c9fbb049c1764d0 SHA-1: d5f4a4e61a36afec6e54dcf16ad364a95b0607e2 SHA-256: d1cd7eb1f96804e8b5bf37abf629aef716441ae57cfc010fc9c6d265f3548c12
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 websites, many hosted on compromised CMS uploads or disposable domains, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirection or phishing attempt. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tara77.com/clients/46590/File/61327161804.pdf In PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/38224975338.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/selisidapad.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/534098843.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b688211ec4---19695264351.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/l7f26pha4n4ndvuhgat0gthbq1/17836157850.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a335da758b9---49266030326.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/timeponixarujepogig.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/mokajivebazevuretogu.pdfIn PDF document text
    • http://gabortech.comadmin/file/63280957071.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e77792a31951ad6ea867c4b7c2dd1e3a/15315630713.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125639bd0fe1---zexidowogotivexomibapakib.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d262501e---22607996772.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/3ed247367f97f8a48744810c638b3935/7263864264.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/4a0cd0f35549b1167c9d18f908ae70bd/gumukuvilipaxu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a73e738efc496789cfdef400b6ab6366/jonorojukenazibaxoxaf.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/zefeloz.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/lidiz.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/22853473936.pdfIn PDF document text
    • https://empresa-venta.hr/files/61460443648.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/335603996a055f6dd0fb1e8cbc339d73/kupujigusozezimewaxobutum.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/vuwesujowegiwa.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b264e7545d0---72008376225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=genetics+and+heredity+worksheetPDF 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_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 18192 bytes
SHA-256: cd775c50decca5af5ced60703ffa3142c23f35e5ff9e3b60c55fb7e7b0c80670
font_02_sfnt_off0001328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 10752 bytes
SHA-256: 996d07b721b5954531d36bddc74cbf17aba0f7271cbc008741a8bf9a2fafc4b1

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