Malicious PDF — malware analysis report

Static analysis result for SHA-256 b728e3cbd466df8d…

MALICIOUS

PDF

93.9 KB Created: 2021-07-12 23:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3977dba364e470c28e01a8b996cdc432 SHA-1: 659e3f497ddfafde965f7b38c3bed6a1264e8819 SHA-256: b728e3cbd466df8df14fd7c16e875073d81ad3061382bb9ccff34cd67b319f37
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the heuristic findings strongly suggest the document's purpose is to lead users to external, compromised resources.

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://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/51c293bee38408702c137933a483851e/zonexi.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2864115944---detigivexowogimejor.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db7ff0af1e4---95686695904.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094646220c8a---likosamajesa.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9f0e795be5985207592f5ec1d84c949a/laxovuzavoratig.pdf
    • http://bogelaipigeon.com/upload/file/51815986153.pdf
    • http://polloricowings.com/uploads/files/lujunakatusebanipodevabi.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9qaususp47an14vhlgh71qjl9n/85140570726.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd49e610f---92140571985.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f482ad59b---fonupenopetedolugox.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k9tidldlt208or00klfsh7tnb8/vilenabi.pdf
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/39508477.pdf
    • https://menlopark.com/wysiwygfiles/file/zajejugetu.pdf
    • http://apsons.eu/files/file/xezikatobazijonezatarerak.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/todevipukefunom.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909404acd88---seropakiniregusibu.pdf
    • http://sacoorhealth.pt/site/upload/file/josibumog.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6e95190b580ba0c0ba91c1bd733cf970/povabov.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ci630ie6vs0rebv0cba8des4d3/60244795350.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/velukexotuda.pdf
    • http://luberoff.com/userfiles/file/buxelefaw.pdf
    • https://vyrukrc.lt/userfiles/file/27911953992.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef41f80287---betowuzowuwunimelibiwekix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=redundancy+pay+definition
    • 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_off00010da1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16792 bytes
font_01_sfnt_off000125b3.bin
fb2dcea687e4627ed637cea221391d88ac6bf5f4e28f2930fd2539bcbbe1a113
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 17176 bytes
font_02_sfnt_off00015262.bin
d142b636e511a6a56daf1d047abb5f573dec79edb075b9777ce17775514829a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15262 10556 bytes