Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1d67c9f37f2ed6…

MALICIOUS

PDF

77.6 KB Created: 2021-08-18 23:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9ddc3d281dcab1984a705be5213980d SHA-1: 3dbc7e1667111fdde6610c652a34714731994a46 SHA-256: 5b1d67c9f37f2ed69d2d528479bd654325890cdb7e8ce9748e9879c35a6d7494
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely designed to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7354

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://zimaletto.com/uploads/file/76745364322.pdf In PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/78919344152.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/9159590129.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/seronokezerubazutewas.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fbb99ed8ab02e38a267ee4897d9dbfab/57337776359.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/5168159091.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/63459556087.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/buleriratuvegituwixumux.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/dalefem.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/49745152927.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b19ddcf976---pifanakafodopuji.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed2210657---40721120006.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f905e09c3b1---janet.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084622879287---870652871.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1625858044.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/54d3cca3c057b5cde111e379fc87beae/mefuxaletozenu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806b7758749---zurezuguzabiluparuxip.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/m88b2jec5ma6nkbji4lj31d3lc/18275300638.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ceb57acbb48075c9c55101133dad9979/13792568720.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/69548798199.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/5833278758.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/52360839173.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160744285770bb---51128622032.pdfIn PDF document text
    • http://ubest.ru/images/file/nolirir.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/79239320905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=muscle+contraction+pogil+worksheet+answersPDF link annotation
    • 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_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 10924 bytes
SHA-256: 7245a8523d5f73757469871cae17af338fa20f44daa1c64d13c4ea091dc7cbf5