Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90b27bd68508528…

MALICIOUS

PDF

112.4 KB Created: 2021-08-10 10:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 349718515d82a39d40933cecab061d4c SHA-1: e6797d6d7e63e8084db1fd7780934dc9ee4ea0e3 SHA-256: d90b27bd685085285ae1eade1054fce325a48b095eb09dc60be0a852c80b9f99
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16110eb9be42e8---mijipajezesofisog.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160772089ec541---wazibolugedubagugin.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/maruzenujo.pdfIn PDF document text
    • http://keacg.com/upload/files/gabadizisexomatuje.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/81813751389.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/dopemifomujazekix.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/cf822f3a46731689af6fe4432fe11b1b/15079450203.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/8b43fe29ca963a9b222693b003db1ae6/gazetotepozasupa.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/44662596935.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/jogawakejinuvavajabeziw.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/21893227078.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5a351fd0c673e7c25bc3821d4cac8edf/43243498330.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/87478448982.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5d93618321d600ad7a245a15bd34d60d/xevavekexadesiroze.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1fg7qv9096njpkek68psq6chuo/kobukoboz.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/wuwiluzerodijav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cbc975a06---69353831431.pdfIn PDF document text
    • https://pmms-online.com/assets/file/37626397934.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/93115228842.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/65247988388.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b2bd108c---jojanikiwekubogidelotu.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/texemalemuzuvemonabid.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/mokug.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/56240316102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=when+will+miraculous+be+on+disney+plus+canadaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15102 17668 bytes
SHA-256: 5049ed7fdd8d6a2bda4235533518f8cd5e025a64998cd495f102e12f572e3d4b
font_01_sfnt_off00017f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19774 11116 bytes
SHA-256: eadbdfbcdce8169b5f8d04fef51d32fb73b81de3ac2fcc52f182f344d6869234