Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3a4227f45c4f81…

MALICIOUS

PDF

82.5 KB Created: 2021-08-16 09:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 12a0689f86143c949db4db1097a75de9 SHA-1: b3ad514be150e2622573bbab0cc7cc8df216b927 SHA-256: fd3a4227f45c4f81cf798f06b5884edd0193947b7e4a89e85c1a2f5329113a52
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URI heuristics confirms the link-heavy nature of the document. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inciboya.com/resimler/site/files/bimalodumawidegunevokupi.pdf In PDF document text
    • http://bluecars.pl/userfiles/file/belovu.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/pubemawixogenimiwimobu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dscqoh6ngiivqt0g9d5gpia7k7/loxadosagaxadaranole.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/82927601051.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e69e470c957089f70a9d43bd94b518f1/10211323667.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/gac9bns4pkkenrts0i5383t3p2/mupivugifu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9189342b4f---32408475887.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/62562609472.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ru8t2345rnqldgs6kt6nho1ln7/puzezososiwu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/7f7rqg4ir0po1n44hoha6lp5ma/60650442184.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/vuzer.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tmcqahmqla447fa6dd4csrjn52/99528153190.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d0053f4de---fezakusaxezerudananuk.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ddb627ffaa404c8c4cadf2c8b572335e/66882709050.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/gepejo.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/gafineguvukexewifix.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/82238070696.pdfIn PDF document text
    • https://flyags.com/editorResources/file///30013135715.pdfIn PDF document text
    • https://landi-bg.com/images/file/gajelokat.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/73302422585.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160f58891d6365---lidutuko.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160972a398b706---wexedozim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+dunkin+donuts+coconut+caramel+iced+coffeePDF 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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 17376 bytes
SHA-256: 2d3961d56d82ca4fc15e542e8de6eccf0cb0c68adab31c2a7ddf027b1156d316
font_01_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 10904 bytes
SHA-256: dd7e62752d76303c171ae2a0e3d935c06e4cfe6e96508a158fe119be12032c8a
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1