Malicious PDF — malware analysis report

Static analysis result for SHA-256 da429417704e6a06…

MALICIOUS

PDF

63.6 KB Created: 2021-09-07 04:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ffb4a69b895e50bc606371a779db823e SHA-1: 41071d7804094f0fb2a5f569207774006aa46edd SHA-256: da429417704e6a06d52c35eb69c065eb591c7ac6336a336aaf82685580309951
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is likely a link farm for SEO manipulation or to distribute malicious content. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

Heuristics 4

  • 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://fotoprint.lv/downloads/file/gojimuliverexojuna.pdf In PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/zopuvemamowej.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/kk7hieo5jaslum50gmb9e3kih6/dawajodedoti.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3j41enb2un07a1mmgmtfhabab2/kanemok.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/38364387161.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qn6lr5i7jkkp29ktjddd4lkf7q/79339049816.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4faec9f54f---84333610635.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/winadegekedeka.pdfIn PDF document text
    • http://paliukenas.lt/i/File/vumerikivokogalevovexuro.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/77097344397.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/70053508054.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/13719168129.pdfIn PDF document text
    • https://iword.de/userfiles/file/67428580523.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9hr0lopf83dmai208v6bhe12oh/4296571690.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/natosezozavu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a986461fae---nivutawavema.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/71951323134.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3de8be32394a33428cd75f6d9fa01618/7367505624.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/48035320184.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/evaof7ngju4hf6l23014eorvd1/dugafigumileloxudego.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zolofu.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/13852433825.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3eda3b4704a2af67e8ed88eeec68b45/loronukibiri.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a58e3482b---13871009069.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aa6beb50d---jusuvinejesidanojumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=stochastic+analysis+on+manifolds+hsu+pdfPDF 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_off0000c41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 10944 bytes
SHA-256: a35bab9f755a6f6a8510413f31afe024208f5f7f519028e5ba4d57943f4aa0b1