Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac18899f1ed86ef…

MALICIOUS

PDF

95.1 KB Created: 2021-07-05 18:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f411bf8beecd8e6b5f652a0a8be8b8a SHA-1: 3bbdc7305149a7a0b8fff9e75c535fed36f823fc SHA-256: 9ac18899f1ed86ef720257f5be89afef5ea6f19f65c7b09362859de7715db40f
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The document's structure and numerous links indicate a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f8fd587f---68143809154.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/95512179967.pdf
    • https://jamuiboe.com/webroot/upload_media/jixunevisalij.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dcf742f072f797b1318a5e0436543ff9/raloworuz.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4c2ab1e0dd855927e99ccfe331c17c34/jusajubasivipumujado.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52090614945.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd2f605cc---memurilovab.pdf
    • https://digireg.si/upload/jujifosozeziwaxuzejovagus.pdf
    • http://tokstar.com/_UploadFile/Images/file/jutomixobanesoremed.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/dc8d4ab69551818996e58994bc72c883/67151310695.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160798da1c272f---53755218597.pdf
    • http://elcampoeco.org/FCKeditor/file/narido.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/553e0e65c561da7f007e2490393f2ab0/nulivosuzuwo.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff8174f30---sovutibola.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1f0ea78b0bf02248f8596815b6307391/11853297204.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rikj2nurhcd4q0itgii00h0sf0/52542021614.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771bf07c91c---fisokomutepokifomip.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c2ba05b7e---68482204319.pdf
    • http://classicalgardenstatues.com/uplds/file/15891732067.pdf
    • http://greece-ex.com/images/blog//file/dagebalifenunokijibof.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607192995431c---32028489684.pdf
    • https://calendarsunrooms.com/userfiles/files/49452723396.pdf
    • https://guijek.com/userfiles/file/gonilizop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=types+of+coccidiosis+in+poultry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 16792 bytes
font_01_sfnt_off000128ed.bin
d85636fa10bc3580fc48b3b4c0b7dbbde06b75181c9c6f6608d567e0da24e223
pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 17568 bytes
font_02_sfnt_off000156fb.bin
49fc9970d495c0fcbf99760b07bc25c6563c5deb7d5cac375a670edd5f79705f
pdf-font-stream PDF embedded font (sfnt) at offset 0x156FB 10628 bytes