Malicious PDF — malware analysis report

Static analysis result for SHA-256 988871a11f242120…

MALICIOUS

PDF

60.0 KB Created: 2021-09-07 13:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 65df7acaf7483427c6d77598b0ceab2c SHA-1: 4875be885e893eceb2c486dad3f4a46ad3cfa8f5 SHA-256: 988871a11f2421204c92a46466fe48d21acd799cb474fec59c653c6fab6867f4
162 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8925

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://anvlaw.com/userfiles/file/49544624398.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d279be390c---24376576070.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/moratedab.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/4855883525.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/71065278041.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/58739867374.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/65246850388.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/92347fjbpl8b977om76tufp3t6/38933754399.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kitusexegitogukukatop.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/wotovunodapilutukodo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed6b0bbe8bb---nafadumogedul.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7a36b994---letimurovaxevi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9584f56cfaa2929eb72367a48142546/wesatirupapuwapofup.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/21053147969.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/52528744417.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf3d26e3f---sivovusavupaza.pdfIn PDF document text
    • https://birotex.rs/images/files/sulavidiwe.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c369c8fad1ec7584d87daa2e500f7b8d/23075759506.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/vepevosowazoruvib.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/xinokotexowumasevaba.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5ed9bd0998cf5fbef3c12b6b6a90bf78/tajorelarizi.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53312637091.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/duvesapajajevenu.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/dodavafedupuburuxupusixab.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/qiev6fhonuv603q7rsir2lstp6/parupuwox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cerita+malin+kundang+dalam+bahasa+inggris+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1