Malicious PDF — malware analysis report

Static analysis result for SHA-256 409b38af656c9d1f…

MALICIOUS

PDF

59.8 KB Created: 2021-07-19 00:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1cf1a402a8906e5cb08bedd29f17675e SHA-1: a0fd603a7d471ceb8fe69ecbd41fe5daf2779013 SHA-256: 409b38af656c9d1ff9141b919224f60913e76251454d7476c87b43501d4f729a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm used to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7591

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2e99eb8144e82d1dc006d83df67d201e/59023719049.pdf In PDF document text
    • http://nutronicltd.com/userfiles/file/31146442556.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/funezukesok.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/fozanijebokulojigajuda.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607658a51f21d---zekarizotabogegunalipimu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/68095428942.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cbeb7f82bb560d1dd666e3c3a4b662ea/28883888835.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/monovuvavowosiri.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/popizibifagufuma.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/62869609073.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64bfbbc400---gatenifojo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/029a737f39e6f51d1f3a0a46ba10006e/pesenivavogulexiw.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p3f9nf5h9bscogkmmtmfjl6834/51952848704.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608041ac75ee5---87182904631.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vikoxusu.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/zemixuxixamudanid.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f28bb713eb11ee68496339f7a6ad9ed2/26622614961.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68db245b8c---jedolasawaxajije.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/90665048535.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/17020769080.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/momaxuwibobusogalaxus.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/dapide.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16092461092187---62971669734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+textbook+on+power+system+engineeringPDF 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_off0000c320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 10904 bytes
SHA-256: 9d90ca12ad00a262fc9d4aa8349dc8f106ce5a6c65f5a438e06c70aadb784247