Malicious PDF — malware analysis report

Static analysis result for SHA-256 5999d950f67de6db…

MALICIOUS

PDF

64.0 KB Created: 2021-09-19 10:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1528cf7f8fa36d11582128b72689ee1c SHA-1: 201b883aded9cb1e15c8a42fcb1e8574dafcd4e9 SHA-256: 5999d950f67de6dbbad4fd73168ea471dc10b254c35c1cfe2090609fd02b0776
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly suggest a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

Heuristics 5

  • 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.
  • 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://laznia-radom.pl/userfiles/file/17667723506.pdf In PDF document text
    • http://2safe4u.cz/UserFiles/File/52130375398.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/ladipetupawagotidegadapez.pdfIn PDF document text
    • http://soc-in.com/data/media/files/48202261236.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132d68228e40---xavilano.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac34c8f1b4---95831837638.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210913172649.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/vizomaselesazewaf.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/duxafamuwi.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/musexadetuvanafo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161443ca9cc04c---wijevobexisotuz.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/radoguwulabiwekaf.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/vigulunejedibelaju.pdfIn PDF document text
    • http://teknis.it/userfiles/files/72819986738.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/35605158517.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f6abb0ce---vinilibomupev.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/22691425631.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/balibetotuzedivazitato.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/robefojujavad.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/80034623794.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/jinividoxekisubijutegopo.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fizobajemipabobapikoxekek.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/zurobiza.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/pudibirinigazotes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+numerology+chart+readingPDF 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_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 15212 bytes
SHA-256: 72ddf8b75d985c46e1e08574cc6fcd9e1da64070793a74343208e800351ca6a4
font_01_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1