Malicious PDF — malware analysis report

Static analysis result for SHA-256 37857c807f7593f3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-04 20:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 187a9b0c239db2d6f7bd0e3cd675d85d SHA-1: a47372cb9298bd9d9278fb38cb667c357b0efac2 SHA-256: 37857c807f7593f337bd65388891ed53130ca430c2989bc34ef5040402e18a04
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness. The PDF contains a link farm pointing to numerous PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This pattern suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://batikatravels.com/userfiles/file/97494699095.pdf In PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pupiwe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8c5a7ioir4hklkj5ds1bi1pbe8/21405754405.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/kituporunibuzowijut.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/38058074090.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/miwifil.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/zowevedajojujugozazijoti.pdfIn PDF document text
    • https://capecoralliving.com/media/file/ladafeke.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/mibiselofizakadawaku.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/11249676401.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfda57d7589---rebegemidogabezof.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/12470098883.pdfIn PDF document text
    • http://araonline.hu/uploads/file/81840703078.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c0e0bd1be08aa29a8cfc6d86d2afbd35/23315183425.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a85d16d59---xosewobuwexuwowanamokuju.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/garovodusejopufit.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7b1e15e43b6e4d7d6da6fca5737fe021/15194195543.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/46200254932.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/setilopobogijafasu.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/tamidixewuvedavenumosera.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/96834114955.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/vunidovubagubiruge.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/23286853100.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/janovejokupifozis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=penny+catechism+pdfPDF 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_off0000b096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB096 14604 bytes
SHA-256: 405b5a465ea6793ae490d3a67ce74282b30e6b57d8a0abbadeb6f44adb11f9c7
font_01_sfnt_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 10736 bytes
SHA-256: 8145ca04da9d738b8abfc724c763ee54d7585768c84215c12559840cb053a020
font_02_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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