Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0d3bb9e61d33c9…

MALICIOUS

PDF

58.1 KB Created: 2021-09-05 17:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d25055401951357a1aaa5d837e4a131 SHA-1: f3bc8e203bab9d68fb7ad6a426220eee23342912 SHA-256: 1c0d3bb9e61d33c97175a54e1466728a236bca52d970cc5a5275d17c8cb0f228
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely serves to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8104

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.
  • 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
  • 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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae169ddc7---26350884382.pdf
    • http://amsasecretariat.fr/userfiles/file/fowogeb.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e9657304124---2232285984.pdf
    • http://alt-1c.ru/userfiles/file/83357431743.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/13716986724.pdf
    • http://exito-opakowania.pl/userfiles/file/42103048538.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a27f720d3---54561960431.pdf
    • http://zygzak.eu/foto_dane/wysiwyg/File/44448894211.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612c02b18a8e6---jiwevowepobezowudexujuz.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4b2bf112---wofivuwenoveg.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/63420697209.pdf
    • http://kaowei.tw/image/files/20210620_040457.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/34003563717.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9243a29be---nixugaj.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdc5204bf---tuxobakitik.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4229285e---51081555423.pdf
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/guxojikimigokijumilesupa.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/b1e50b4155dbd532b0aaf6785cfd250d/11119139805.pdf
    • https://toskov-yordanov.com/userfiles/file/40824549236.pdf
    • https://salvatoredivilio.it/userfiles/file/3938776290.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c88258fc4---xopakipu.pdf
    • http://agataklimowska.pl/userfiles/file/41789007013.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/ravomot.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a8c19f06---ketan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=primary+source+analysis+worksheet+close+the+gate
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbc6.bin
3d9c1107c60ef49f530a35c892b548ddc97f571573c2ff605ff6df148cf93aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 16112 bytes

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