Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84af59d0d6deb37…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 09:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6829d25acd0f627f7807a482d9b4915b SHA-1: 480819cb63fb6dc46151d0dd1d3d96d0925ef409 SHA-256: d84af59d0d6deb370253a101e61cc18aebbe617de9de60698c495aa48c0508d8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm directing users to multiple websites, several of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mygenius.ru/admin/ckfinder/userfiles/files/vunadapotufa.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c07f09b4fb---36765581405.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/1384297333.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/zejujilelekuriviper.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bb8eb4504---34242578082.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a83a08a29---66470438296.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e04c5b77b634f2e8e40f546c4cd83c77/veforunivalusudimag.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/31069019297.pdfIn PDF document text
    • http://petrduchek.com/files/74476923916.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/55684150025.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/33158982858.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/93101573679.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/mapubezefozuri.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/zivusebepafil.pdfIn PDF document text
    • http://iknow.pl/files/file/pesaxubegabe.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/dovubilatugewa.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1b492031---92978662764.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a68e724ab73d8b2d6ec966c0b3bc1501/pujefuruwopige.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/69062693764.pdfIn PDF document text
    • http://abc-tel.ru/data/File/susilidekidoba.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/gifipemuxirot.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614865db3a719---jozup.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/79d52cb8923ea2e9a570f31320ab81e5/73276891124.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/zofaderixovazuxave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+moto+g+2014PDF 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_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 10436 bytes
SHA-256: ec98758fa33e24825c07624ab056d12bfff00985d099301215a10d9fad5a5c38
font_01_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 18776 bytes
SHA-256: 1cfb1835f75da90f219ed34f191ba110f7331a6d990f166047f128ad3d3da951
font_02_sfnt_off00012e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1