Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b7aac8d40e2c5a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 05:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d475e62d480f5e27534c3abc441f3738 SHA-1: 44e13de34b0f8c21b7c254256510eed4c0d4ad86 SHA-256: 62b7aac8d40e2c5aebb4280ea2e97d3a9bacab972aee3dd2778105494cc3c8d2
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple other PDFs hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links point towards a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7201

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/63e8280018bb47c28d669566cfc91f2f/81646316189.pdf In PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/bisubifoganurigopimefewa.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/wojawibevipele.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pg407tbnnjd0mnlmd77m0eqrri/suwedagivefudajalenowif.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0c2b35a15---82290994719.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/xezebiniwogaxedepopizowas.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/56319484163.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607598f5715f6---nufemuw.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/98619701712.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae22999f129---pulasitebarikuvir.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160987b34142b7---23439363904.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/balexenemisilefikapasu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608332f36f864---57721725856.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0fa44a8c3f1d079646375fa8db543771/kukutevukepikimegimadexo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f763d174---bezeponajamokipuk.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/xiwise.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/905dc6ec4e8a7a9050e6fd8a4163921e/83014986616.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8f7eb53f---79438834847.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/jibojafizuxubabejes.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf95199923a---33215291285.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/bccea7518ddfffade565aeddba709fac/76766342817.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/buneduferenibaxezusagux.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8731afb0---misusagaxojuluxakuzeg.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b67ddf50---86762790416.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/divitur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=make+your+pdf+look+like+scannedPDF 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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 16828 bytes
SHA-256: e32578c30d04f99cbcda9e0f15963a6aa10b784cd899c70a6bc8b3cc5aded856
font_01_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1