Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be841b53d1f10cf…

MALICIOUS

PDF

81.0 KB Created: 2021-10-07 06:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 04e10672115306d38ee0b4d99a76b7be SHA-1: 9cda217050f046083e669daa30f4601e07e4666b SHA-256: 6be841b53d1f10cf862b14057cba8f05d194fe2df89536f93c45aa4d657df9c5
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the presence of a link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5833

Heuristics 4

  • 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
  • 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://medvor.ru/uplcv?utm_term=fifty+first+days PDF link annotation
    • http://guchen.ru/d/files/84882730475.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/54552947601.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/16707893735.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/70785991585.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109041756393412.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3ec541f44---11367638359.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/denizinavofolozel.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210923151405.pdfIn PDF document text
    • http://lawngo.net/fckfiles/puxakazalimofez.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615902489077e---kawix.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/bidimujudejaduleko.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/zowep.pdfIn PDF document text
    • http://gestioniarmatoriali.it/78470065382.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bb579e1224fa54e86ffb6f111f52a81b/24709803170.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/zadigunaj.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161376b5723cb1---24807592242.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/64954361179.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7625eb2f---63608354340.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161317814b007e---81670261118.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/mekaxogugokarez.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/49406176373.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/kususuninixedunebones.pdfIn PDF document text
    • http://gibisch.info/files/files/72916413188.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 18184 bytes
SHA-256: 3f05fc3b6bbc8e4712cd9b95a8702c57c5b0bee5227e972dba4ea06568bdfb3a
font_01_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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