Malicious PDF — malware analysis report

Static analysis result for SHA-256 3141abb5bc0be5cd…

MALICIOUS

PDF

62.5 KB Created: 2021-05-10 06:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d294ab64a3524ee49aa6baba8349232 SHA-1: ec1dff678c1f6785e7a7d0b637721069f200a73a SHA-256: 3141abb5bc0be5cde3c7da7a7e39815cb716174e33e56d469618de802a499724
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to these potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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 http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0c3085c411efccbdb29f45322cb2a9c3/sojabuwojali.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0aaae73343bbf5df25188dfff0adaae1/40284484259.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ireqo10f2ig799lqm9p1qr3jvg/lidumefuwilerepud.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18d333474---12579776673.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb10ade29---28929774863.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5e683fc09f03d350e52d5d8764482b01/vapofokamo.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a86418d5d6---tijutenawirubexuvapinin.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/32b1dac8145a4b640f17916f97390d03/34458561173.pdf
    • https://vestol.bg/files/file/figizavut.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087de14a980f---ximunuzononotemivopazad.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/bdb9ld2d51lelkquojll109hd5/47212814303.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a5f976c8fd8dda1d2107b84cad57bba2/89406791109.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1a4e168a890432699f089b208d03b9ca/19373893560.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d022f5bf8e---39490159798.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ef36071843e4a4ac2378ccc9e997a57a/35463772807.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53fbe5888---96164405578.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ran+maidani+bhavani+talwar+dj+song
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d790.bin
2568044e23aa0d324329b7abc68f793e6677d27bcf5940da6c8c43a7e8169437		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 5616 bytes

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