Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f61d6023a29301…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 12:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc72c229f1f4282a7f93f5df9397e6eb SHA-1: 30c4d336e6d4a3149f255f97a78af6a20ddf7893 SHA-256: 51f61d6023a29301a24faa8cbfc11723970f2b9331948df5dfa78cf43916036b
154 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of external URIs and link farms on potentially compromised CMS uploads strongly supports a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

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://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/84782856618.pdf
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/zuduruk.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/58285167563.pdf
    • http://www.farmaciapenil.es/userfiles/files/2259485443.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nrg57hdk7j32jqrde6u24e1m75/wamanixubele.pdf
    • http://leylatoprak.com/userfiles/file/49493977653.pdf
    • http://edeins.com/userfiles/file/7516096359.pdf
    • http://hodinovysoused.cz/upload/file/womilimafunovafexa.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/jobogoruzefefow.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a829d4a095---22481963861.pdf
    • http://doctour.hu/uploads/ckfinder/userfiles/files/dovilopejobedako.pdf
    • https://lifetides.ca/cambridge/uploads/files/48898662022.pdf
    • http://zezoalza.com/ckupload/files/46233427631.pdf
    • https://ciiinnovationsummit.com/ci/userfiles/files/14431864493.pdf
    • https://sergiomauri.com/images/file/47634414565.pdf
    • http://hcvitamin.com/webroot/img/files/nuvitixorewijiv.pdf
    • http://hanmih.com/userfiles/file/20210918084516.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/modevomowixowefejawo.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6f0734f1c---vipujelema.pdf
    • http://barbusci.it/maisUserFile/file/fijukowozizil.pdf
    • https://sunridgecorp.com/uploads/files/202109172151204269.pdf
    • https://gilbertems.com/videos/file/kapazofi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=aplicativo+que+transfere+contatos+de+android+para+iphone
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF2 16792 bytes
font_01_sfnt_off0000d304.bin
ee3785462f4176ac9feb67dd1e7a9ab9a1c928152c6c31a1c8263e930dc5983c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 19368 bytes