Malicious PDF — malware analysis report

Static analysis result for SHA-256 beec04feac83ba03…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 21:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ce5b0663852096f54168f631de922f2 SHA-1: 850e9a58e3c01b59c3f3489c3d43e4a68691e631 SHA-256: beec04feac83ba0353d1ba2b0b7e89e7cc5cc277d591ec33587c05e4428ce1a5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7562

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 https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/84c2b2bd24a2efb6c0b2a4f3ec7f7a84/tetonoripikuxarijobusuv.pdf In PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/17301040662.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/30527553002.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/xojulerak.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/38880656566.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/mesaxomepurudenogek.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-2/20210902051359170397.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/s6im4u0gikhs3jric01tj5gfto/defetotif.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/45109433212.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f22a6b85f---95816575450.pdfIn PDF document text
    • http://stromzeleny.cz/file/5365587728.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/97923684617.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/sijopalunujawet.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/98321925331.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/nifozerefogugu.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/vajot.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85556363066.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/15997622932.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/mevowen.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/24843637823.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/87660191523.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/zolovoziravow.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/48888693358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=google+gallery+androidPDF 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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10308 bytes
SHA-256: 1a99b20c3c4637e52e4ed63839f475e18cdd859d7f875a989350177fbac11637

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