Malicious PDF — malware analysis report

Static analysis result for SHA-256 353482a904d38100…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 16:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03adb0ab4581877416806bd487a0616f SHA-1: 96fc94f0ba83912ed93e2b422f26bd97af0c80f1 SHA-256: 353482a904d38100daa817e803ea3a3b06d40cf8975ebd8eb536e49b5e6c42cc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan', suggesting its purpose is to lead users to phishing or malware-hosting pages. The presence of multiple distinct hosts and the use of disposable hosting further support its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4575

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3bb262356ae8341083a7148a33588f17/gufurobabosif.pdf
    • https://ceral.pl/ceral/pliki/file/vakif.pdf
    • http://ndt-tl.ru/upload/file/64194938183.pdf
    • http://sunjewelsonline.com/userfiles/file/kugizaxovuzegafetuxonur.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0d4nd65ig73o5ek8jt36pq8hag/4389865583.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f054f182d8---36399658819.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b29e05ac---984527739.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/h1m8f25afk58rc6hempt2mrbva/69326558770.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d72944fb---78764672035.pdf
    • https://twr1115.net/files/fckeditor/file/bovoximejebezobaro.pdf
    • http://kengosushionlineorder.com/uploads/files/36475056509.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/62925337880.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af013f086f---37850758357.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608f280aa4664---zetikipuvebagaxan.pdf
    • http://ruoumoc.com/upload/files/97699382664.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a8ffaa8d828edbe547ea5bdd5ac2f841/jazinifepe.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a21ca18600---dugurete.pdf
    • http://chatfieldfarms101.com/userimages/vorawoxuvimixa.pdf
    • https://cafepiolho.com/uploads/assets/78052373464.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1357643df7801f9a8bf6897aaf47e58f/41900142973.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccfb6c2bc3---lozabomulakuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=10+minute+vocal+warm+up
    • http://s292376414.onlinehome.fr/datas/imgmail/file/65305954110.pdf
    • 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_off00011dde.bin
f526e42a2408d919c574b7a408d67a641ce7b4a0a09ba660b58570fb3ef305a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 16744 bytes
font_01_sfnt_off0001495e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1495E 16792 bytes

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