Malicious PDF — malware analysis report

Static analysis result for SHA-256 46930cb456ec32a3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 09:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb4b35c34dc235cf8c9fa0fd873ece55 SHA-1: 55bb1af6a4b2d51735c52abf0467d7f94975f01e SHA-256: 46930cb456ec32a32b83ce4aa219d3672dcaf78ca919067cb2927475c860ffef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream and numerous external URIs. The heuristics indicate it functions as a link farm, with many links pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://coretry.ru/uplcv?utm_term=temple+run+2+frozen PDF link annotation
    • https://jdrum-music.com/uploads/ckfiles/files/23110764097.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/setikevubupazilefokisake.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/10317768827.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210902/files/20210902182254.pdfIn PDF document text
    • http://sql110.com/pic/jofuwosuvubigokusabezeku.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7801f2fa1---61615621904.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495b2a26130---73053820377.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6247a5de---22329116363.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/21408093923.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/jawenaw.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/16831885206.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/falikowebupipudoforu.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/50739705356.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/69413398847.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/tebibivedefowe.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/21231223233.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/jazobuzawuwujov.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///17579481709.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/40186257455.pdfIn PDF document text
    • http://elitvorota.ru/f/file/55311506901.pdfIn PDF document text
    • http://8njl.com/userfiles/files/jixififugalatavu.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80414924999.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/sugosirozasune.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/75600552933.pdfIn PDF document text
    • https://sim2007.com/files/46528598987.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 10244 bytes
SHA-256: 29ca155e58c962eea69c29902788565b72ba5c3268febce41539c69fbff640da
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 19848 bytes
SHA-256: 252254163c8dcba3776941761949dcf523e748b8ab7e1cf9891423ebf41642e0

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