Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfb0ea64144d7a3…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 02:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2357af03396b29915199226643808286 SHA-1: ce5d9e134a5e2f76043628b52cc472c5d340f02f SHA-256: bdfb0ea64144d7a30fa3a1379a6bb1c18d78b963c656b013a312bbb9e263a5d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially harmful content hosted on these compromised sites.

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/eb6d97af0b15c936114c1713c7a2ded4/xinadifiwedubezakoku.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e356bc3b3e---debapikusexobixuwin.pdf
    • http://flirdining.com/uploads/files/xatotutigadusezenivi.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1cf88bdfbd0996991663ca8741362ca6/mimolat.pdf
    • https://dienlanhbachkhoa.info/upload/files/84724171654.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/03tp8p6p74ir417l3tm6plesdj/47633014331.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/cef9a4ea0d0a6b1cd8108aa4c5017e11/sewolavedamepit.pdf
    • http://esipro.fr/userfiles/file/voniruzumigefope.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5ad713e0---laxitakodepojof.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d445f6cff2---nisabenalopufebutewunugu.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799ac42903f---64112321965.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d73828039---wizukujakekebivunuva.pdf
    • http://blatt-gruen.ch/files/ferix.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5475b5d63---88149585295.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d380b152cf---ranafewiwop.pdf
    • https://akemi.ro/hirek/file/rodog.pdf
    • https://washlounge.in/ckfinder/userfiles/files/tafalusagerup.pdf
    • https://noddy.nu/images/file/5800660433.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095924d0944c---18142860123.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0ed4bf973---metirasatilatir.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/93151078488.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f2a8dd9faa0ccf3477e7b6592364162f/8007028839.pdf
    • http://dietmoiquangle.com/webroot/img/files/kuzenofuxukomurikesosu.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/20be2df77c353f1beab0b7ebbb8d83e4/tuwena.pdf
    • http://amghanoi.com/images/ckeditor/files/ledisevisumizaleri.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wrap+up+business
    • 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_off0000f0b0.bin
cf88024797396dbb3f1ad385913ae9f3bb0c15a1d27cf53c86209f1b9f377225
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 10216 bytes
font_01_sfnt_off00010771.bin
93f7634cc7d932012b463009f04e0b137a674917f53e7521472fcb6adbaac111
pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 16984 bytes
font_02_sfnt_off000133b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133B5 16792 bytes