Malicious PDF — malware analysis report

Static analysis result for SHA-256 24683bb6337ffbb2…

MALICIOUS

PDF

97.8 KB Created: 2021-07-20 23:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8abe4056778dff26e42e6c8f18dcfb75 SHA-1: de200b9c39fa2693b61c855abf57fd56dbe35c3b SHA-256: 24683bb6337ffbb28842b704de908006decc2624a5b91c776c7fb8fe735d2b38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the presence of these suspicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://silverwayshipping.com/userfiles/file/55755673778.pdf
    • http://okuninka-biale.pl/userfiles/file/kanedisikidivigajebaboboz.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/buqs1p0h6ja6b8l8abnvlvqnt3/jujawarelewu.pdf
    • http://kayamedbursa.com/userfiles/file/gubaxixolujaxulesulufaseb.pdf
    • http://nutronicltd.com/userfiles/file/sidere.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada48170d6---teperitubibinepiwofotal.pdf
    • http://pogotowienaukowe.com/Upload/file/zufubafovupuzebi.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3d4523e55f25ca4f2ce22d8ca8598145/fubume.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/33f9bf3f2f268e66dafad440acd788ac/42664752397.pdf
    • http://renovator.cz/files/file/48082552518.pdf
    • https://marblo.ph/app/webroot/img/files/38078222569.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/kijasuginovixaxofubonuse.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/56491909596.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d312638160432502798747652ff8901c/31026579558.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/21ad537da44e924e5f7ec9e74e8fb238/fimerosopovegizozenasirof.pdf
    • http://nickels.design/ckfinder/userfiles/files/katulu.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ecaee985f110a3204c452a5c06e78838/jadojajowaf.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6045a78df1f764e5dc21d2f2a5372ac4/43136424497.pdf
    • https://parc-hotel.info/file/nawewo.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/04a1c5bdff22e90d377b6ae78f3b6a58/57751446150.pdf
    • http://unipsyclinic.com/userfiles/file/20210706090355.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cos+36+degrees+in+fraction
    • 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_off000117b7.bin
90c03765f72966b0b64bf580e8ac31476fee601c2393cccec708b9a356ba1ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 18468 bytes
font_01_sfnt_off00014840.bin
24603ce1e7f631e3aaa0c3e42493570c525bb8421eeb0c94d97ee3b3e4a6e371
pdf-font-stream PDF embedded font (sfnt) at offset 0x14840 10976 bytes
font_02_sfnt_off000161ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161AE 16792 bytes